1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _FS_CEPH_MDSMAP_H
3 #define _FS_CEPH_MDSMAP_H
4
5 #include <linux/bug.h>
6 #include <linux/ceph/types.h>
7
8 /*
9 * mds map - describe servers in the mds cluster.
10 *
11 * we limit fields to those the client actually xcares about
12 */
13 struct ceph_mds_info {
14 u64 global_id;
15 struct ceph_entity_addr addr;
16 s32 state;
17 int num_export_targets;
18 bool laggy;
19 u32 *export_targets;
20 };
21
22 struct ceph_mdsmap {
23 u32 m_epoch, m_client_epoch, m_last_failure;
24 u32 m_root;
25 u32 m_session_timeout; /* seconds */
26 u32 m_session_autoclose; /* seconds */
27 u64 m_max_file_size;
28 u32 m_max_mds; /* size of m_addr, m_state arrays */
29 int m_num_mds;
30 struct ceph_mds_info *m_info;
31
32 /* which object pools file data can be stored in */
33 int m_num_data_pg_pools;
34 u64 *m_data_pg_pools;
35 u64 m_cas_pg_pool;
36
37 bool m_enabled;
38 bool m_damaged;
39 int m_num_laggy;
40 };
41
42 static inline struct ceph_entity_addr *
ceph_mdsmap_get_addr(struct ceph_mdsmap * m,int w)43 ceph_mdsmap_get_addr(struct ceph_mdsmap *m, int w)
44 {
45 if (w >= m->m_num_mds)
46 return NULL;
47 return &m->m_info[w].addr;
48 }
49
ceph_mdsmap_get_state(struct ceph_mdsmap * m,int w)50 static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
51 {
52 BUG_ON(w < 0);
53 if (w >= m->m_num_mds)
54 return CEPH_MDS_STATE_DNE;
55 return m->m_info[w].state;
56 }
57
ceph_mdsmap_is_laggy(struct ceph_mdsmap * m,int w)58 static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
59 {
60 if (w >= 0 && w < m->m_num_mds)
61 return m->m_info[w].laggy;
62 return false;
63 }
64
65 extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
66 extern struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end);
67 extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
68 extern bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m);
69
70 #endif
71