1#ifndef _FS_CEPH_MDSMAP_H
2#define _FS_CEPH_MDSMAP_H
3
4#include "types.h"
5
6/*
7 * mds map - describe servers in the mds cluster.
8 *
9 * we limit fields to those the client actually xcares about
10 */
11struct ceph_mds_info {
12	u64 global_id;
13	struct ceph_entity_addr addr;
14	s32 state;
15	int num_export_targets;
16	bool laggy;
17	u32 *export_targets;
18};
19
20struct ceph_mdsmap {
21	u32 m_epoch, m_client_epoch, m_last_failure;
22	u32 m_root;
23	u32 m_session_timeout;          /* seconds */
24	u32 m_session_autoclose;        /* seconds */
25	u64 m_max_file_size;
26	u32 m_max_mds;                  /* size of m_addr, m_state arrays */
27	struct ceph_mds_info *m_info;
28
29	/* which object pools file data can be stored in */
30	int m_num_data_pg_pools;
31	u32 *m_data_pg_pools;
32	u32 m_cas_pg_pool;
33};
34
35static inline struct ceph_entity_addr *
36ceph_mdsmap_get_addr(struct ceph_mdsmap *m, int w)
37{
38	if (w >= m->m_max_mds)
39		return NULL;
40	return &m->m_info[w].addr;
41}
42
43static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
44{
45	BUG_ON(w < 0);
46	if (w >= m->m_max_mds)
47		return CEPH_MDS_STATE_DNE;
48	return m->m_info[w].state;
49}
50
51static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
52{
53	if (w >= 0 && w < m->m_max_mds)
54		return m->m_info[w].laggy;
55	return false;
56}
57
58extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
59extern struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end);
60extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
61
62#endif
63