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