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
8struct ceph_mds_client;
9
10/*
11 * mds map - describe servers in the mds cluster.
12 *
13 * we limit fields to those the client actually xcares about
14 */
15struct ceph_mds_info {
16 u64 global_id;
17 struct ceph_entity_addr addr;
18 s32 state;
19 int num_export_targets;
20 bool laggy;
21 u32 *export_targets;
22};
23
24struct ceph_mdsmap {
25 u32 m_epoch, m_client_epoch, m_last_failure;
26 u32 m_root;
27 u32 m_session_timeout; /* seconds */
28 u32 m_session_autoclose; /* seconds */
29 u64 m_max_file_size;
30 /*
31 * maximum size for xattrs blob.
32 * Zeroed by default to force the usage of the (sync) SETXATTR Op.
33 */
34 u64 m_max_xattr_size;
35 u32 m_max_mds; /* expected up:active mds number */
36 u32 m_num_active_mds; /* actual up:active mds number */
37 u32 possible_max_rank; /* possible max rank index */
38 struct ceph_mds_info *m_info;
39
40 /* which object pools file data can be stored in */
41 int m_num_data_pg_pools;
42 u64 *m_data_pg_pools;
43 u64 m_cas_pg_pool;
44
45 bool m_enabled;
46 bool m_damaged;
47 int m_num_laggy;
48};
49
50static inline struct ceph_entity_addr *
51ceph_mdsmap_get_addr(struct ceph_mdsmap *m, int w)
52{
53 if (w >= m->possible_max_rank)
54 return NULL;
55 return &m->m_info[w].addr;
56}
57
58static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
59{
60 BUG_ON(w < 0);
61 if (w >= m->possible_max_rank)
62 return CEPH_MDS_STATE_DNE;
63 return m->m_info[w].state;
64}
65
66static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
67{
68 if (w >= 0 && w < m->possible_max_rank)
69 return m->m_info[w].laggy;
70 return false;
71}
72
73extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
74struct ceph_mdsmap *ceph_mdsmap_decode(struct ceph_mds_client *mdsc, void **p,
75 void *end, bool msgr2);
76extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
77extern bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m);
78
79#endif
80

source code of linux/fs/ceph/mdsmap.h