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;			/* expected up:active mds number */
29 	u32 m_num_active_mds;		/* actual up:active mds number */
30 	u32 possible_max_rank;		/* possible max rank index */
31 	struct ceph_mds_info *m_info;
32 
33 	/* which object pools file data can be stored in */
34 	int m_num_data_pg_pools;
35 	u64 *m_data_pg_pools;
36 	u64 m_cas_pg_pool;
37 
38 	bool m_enabled;
39 	bool m_damaged;
40 	int m_num_laggy;
41 };
42 
43 static inline struct ceph_entity_addr *
ceph_mdsmap_get_addr(struct ceph_mdsmap * m,int w)44 ceph_mdsmap_get_addr(struct ceph_mdsmap *m, int w)
45 {
46 	if (w >= m->possible_max_rank)
47 		return NULL;
48 	return &m->m_info[w].addr;
49 }
50 
ceph_mdsmap_get_state(struct ceph_mdsmap * m,int w)51 static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
52 {
53 	BUG_ON(w < 0);
54 	if (w >= m->possible_max_rank)
55 		return CEPH_MDS_STATE_DNE;
56 	return m->m_info[w].state;
57 }
58 
ceph_mdsmap_is_laggy(struct ceph_mdsmap * m,int w)59 static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
60 {
61 	if (w >= 0 && w < m->possible_max_rank)
62 		return m->m_info[w].laggy;
63 	return false;
64 }
65 
66 extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
67 extern struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end);
68 extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
69 extern bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m);
70 
71 #endif
72