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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _FS_CEPH_MDSMAP_H
3#define _FS_CEPH_MDSMAP_H
4
5#include <linux/bug.h>
6#include <linux/ceph/types.h>
7
8/*
9 * mds map - describe servers in the mds cluster.
10 *
11 * we limit fields to those the client actually xcares about
12 */
13struct ceph_mds_info {
14 u64 global_id;
15 struct ceph_entity_addr addr;
16 s32 state;
17 int num_export_targets;
18 bool laggy;
19 u32 *export_targets;
20};
21
22struct ceph_mdsmap {
23 u32 m_epoch, m_client_epoch, m_last_failure;
24 u32 m_root;
25 u32 m_session_timeout; /* seconds */
26 u32 m_session_autoclose; /* seconds */
27 u64 m_max_file_size;
28 u32 m_max_mds; /* expected up:active mds number */
29 u32 m_num_active_mds; /* actual up:active mds number */
30 u32 possible_max_rank; /* possible max rank index */
31 struct ceph_mds_info *m_info;
32
33 /* which object pools file data can be stored in */
34 int m_num_data_pg_pools;
35 u64 *m_data_pg_pools;
36 u64 m_cas_pg_pool;
37
38 bool m_enabled;
39 bool m_damaged;
40 int m_num_laggy;
41};
42
43static inline struct ceph_entity_addr *
44ceph_mdsmap_get_addr(struct ceph_mdsmap *m, int w)
45{
46 if (w >= m->possible_max_rank)
47 return NULL;
48 return &m->m_info[w].addr;
49}
50
51static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
52{
53 BUG_ON(w < 0);
54 if (w >= m->possible_max_rank)
55 return CEPH_MDS_STATE_DNE;
56 return m->m_info[w].state;
57}
58
59static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
60{
61 if (w >= 0 && w < m->possible_max_rank)
62 return m->m_info[w].laggy;
63 return false;
64}
65
66extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
67extern struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end);
68extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
69extern bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m);
70
71#endif