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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; /* size of m_addr, m_state arrays */
29 int m_num_mds;
30 struct ceph_mds_info *m_info;
31
32 /* which object pools file data can be stored in */
33 int m_num_data_pg_pools;
34 u64 *m_data_pg_pools;
35 u64 m_cas_pg_pool;
36
37 bool m_enabled;
38 bool m_damaged;
39 int m_num_laggy;
40};
41
42static inline struct ceph_entity_addr *
43ceph_mdsmap_get_addr(struct ceph_mdsmap *m, int w)
44{
45 if (w >= m->m_num_mds)
46 return NULL;
47 return &m->m_info[w].addr;
48}
49
50static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
51{
52 BUG_ON(w < 0);
53 if (w >= m->m_num_mds)
54 return CEPH_MDS_STATE_DNE;
55 return m->m_info[w].state;
56}
57
58static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
59{
60 if (w >= 0 && w < m->m_num_mds)
61 return m->m_info[w].laggy;
62 return false;
63}
64
65extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
66extern struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end);
67extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
68extern bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m);
69
70#endif