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