1#ifndef _FS_CEPH_MDSMAP_H 2#define _FS_CEPH_MDSMAP_H 3 4#include <linux/bug.h> 5#include <linux/ceph/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 u64 *m_data_pg_pools; 33 u64 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