1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _FS_CEPH_MDSMAP_H
3 #define _FS_CEPH_MDSMAP_H
6 #include <linux/ceph/types.h>
9 * mds map - describe servers in the mds cluster.
11 * we limit fields to those the client actually xcares about
13 struct ceph_mds_info {
15 struct ceph_entity_addr addr;
17 int num_export_targets;
23 u32 m_epoch, m_client_epoch, m_last_failure;
25 u32 m_session_timeout; /* seconds */
26 u32 m_session_autoclose; /* seconds */
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;
33 /* which object pools file data can be stored in */
34 int m_num_data_pg_pools;
43 static inline struct ceph_entity_addr *
44 ceph_mdsmap_get_addr(struct ceph_mdsmap *m, int w)
46 if (w >= m->possible_max_rank)
48 return &m->m_info[w].addr;
51 static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
54 if (w >= m->possible_max_rank)
55 return CEPH_MDS_STATE_DNE;
56 return m->m_info[w].state;
59 static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
61 if (w >= 0 && w < m->possible_max_rank)
62 return m->m_info[w].laggy;
66 extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
67 struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end, bool msgr2);
68 extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
69 extern bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m);