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