#ifndef _FS_CEPH_MDSMAP_H
  #define _FS_CEPH_MDSMAP_H
  
  #include "types.h"
  
  /*
   * mds map - describe servers in the mds cluster.
   *
   * we limit fields to those the client actually xcares about
   */
  struct ceph_mds_info {

  	u64 global_id;

  	struct ceph_entity_addr addr;
  	s32 state;
  	int num_export_targets;

  	bool laggy;

  	u32 *export_targets;
  };
  
  struct ceph_mdsmap {
  	u32 m_epoch, m_client_epoch, m_last_failure;
  	u32 m_root;
  	u32 m_session_timeout;          /* seconds */
  	u32 m_session_autoclose;        /* seconds */
  	u64 m_max_file_size;
  	u32 m_max_mds;                  /* size of m_addr, m_state arrays */
  	struct ceph_mds_info *m_info;
  
  	/* which object pools file data can be stored in */
  	int m_num_data_pg_pools;
  	u32 *m_data_pg_pools;
  	u32 m_cas_pg_pool;
  };
  
  static inline struct ceph_entity_addr *
  ceph_mdsmap_get_addr(struct ceph_mdsmap *m, int w)
  {
  	if (w >= m->m_max_mds)
  		return NULL;
  	return &m->m_info[w].addr;
  }
  
  static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
  {
  	BUG_ON(w < 0);
  	if (w >= m->m_max_mds)
  		return CEPH_MDS_STATE_DNE;
  	return m->m_info[w].state;
  }

  static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
  {
  	if (w >= 0 && w < m->m_max_mds)
  		return m->m_info[w].laggy;
  	return false;
  }

  extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
  extern struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end);
  extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
  
  #endif