include/linux/ceph/mdsmap.h

   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  */
  12 struct 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
  21 struct 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
  36 static inline struct ceph_entity_addr *
  37 ceph_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
  44 static 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
  52 static 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
  59 extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
  60 extern struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end);
  61 extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
  62
  63 #endif