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  struct 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   */
15  struct 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  
24  struct 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  
50  static inline struct ceph_entity_addr *
ceph_mdsmap_get_addr(struct ceph_mdsmap * m,int w)51  ceph_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  
ceph_mdsmap_get_state(struct ceph_mdsmap * m,int w)58  static 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  
ceph_mdsmap_is_laggy(struct ceph_mdsmap * m,int w)66  static 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  
73  extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
74  struct ceph_mdsmap *ceph_mdsmap_decode(struct ceph_mds_client *mdsc, void **p,
75  				       void *end, bool msgr2);
76  extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
77  extern bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m);
78  
79  #endif
80