1 #ifndef _FS_CEPH_MDSMAP_H
2 #define _FS_CEPH_MDSMAP_H
3
4 #include <linux/bug.h>
5 #include "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 u32 *m_data_pg_pools;
33 u32 m_cas_pg_pool;
34 };
35
36 static inline struct ceph_entity_addr *
ceph_mdsmap_get_addr(struct ceph_mdsmap * m,int w)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
ceph_mdsmap_get_state(struct ceph_mdsmap * m,int w)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
ceph_mdsmap_is_laggy(struct ceph_mdsmap * m,int w)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
64