mdsmap.h revision 187f1882b5b0748b3c4c22274663fdb372ac0452 
1#ifndef _FS_CEPH_MDSMAP_H
2#define _FS_CEPH_MDSMAP_H
3
4#include <linux/bug.h>
5#include "types.h"
6
7/*
8 * mds map - describe servers in the mds cluster.
9 *
10 * we limit fields to those the client actually xcares about
11 */
12struct ceph_mds_info {
13	u64 global_id;
14	struct ceph_entity_addr addr;
15	s32 state;
16	int num_export_targets;
17	bool laggy;
18	u32 *export_targets;
19};
20
21struct ceph_mdsmap {
22	u32 m_epoch, m_client_epoch, m_last_failure;
23	u32 m_root;
24	u32 m_session_timeout;          /* seconds */
25	u32 m_session_autoclose;        /* seconds */
26	u64 m_max_file_size;
27	u32 m_max_mds;                  /* size of m_addr, m_state arrays */
28	struct ceph_mds_info *m_info;
29
30	/* which object pools file data can be stored in */
31	int m_num_data_pg_pools;
32	u32 *m_data_pg_pools;
33	u32 m_cas_pg_pool;
34};
35
36static inline struct ceph_entity_addr *
37ceph_mdsmap_get_addr(struct ceph_mdsmap *m, int w)
38{
39	if (w >= m->m_max_mds)
40		return NULL;
41	return &m->m_info[w].addr;
42}
43
44static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
45{
46	BUG_ON(w < 0);
47	if (w >= m->m_max_mds)
48		return CEPH_MDS_STATE_DNE;
49	return m->m_info[w].state;
50}
51
52static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
53{
54	if (w >= 0 && w < m->m_max_mds)
55		return m->m_info[w].laggy;
56	return false;
57}
58
59extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
60extern struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end);
61extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
62
63#endif
64