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Sage Weil2f2dc052009-10-06 11:31:09 -07001#ifndef _FS_CEPH_MDSMAP_H
2#define _FS_CEPH_MDSMAP_H
3
Paul Gortmaker187f1882011-11-23 20:12:59 -05004#include <linux/bug.h>
David Howellsa1ce3922012-10-02 18:01:25 +01005#include <linux/ceph/types.h>
Sage Weil2f2dc052009-10-06 11:31:09 -07006
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 {
Sage Weil94045e12009-11-19 15:31:50 -080013 u64 global_id;
Sage Weil2f2dc052009-10-06 11:31:09 -070014 struct ceph_entity_addr addr;
15 s32 state;
16 int num_export_targets;
Sage Weil0deb01c2010-06-17 14:19:01 -070017 bool laggy;
Sage Weil2f2dc052009-10-06 11:31:09 -070018 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;
Sage Weil4f6a7e52013-02-23 10:41:09 -080032 u64 *m_data_pg_pools;
33 u64 m_cas_pg_pool;
Sage Weil2f2dc052009-10-06 11:31:09 -070034};
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
Sage Weil0deb01c2010-06-17 14:19:01 -070052static 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
Sage Weil2f2dc052009-10-06 11:31:09 -070059extern 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