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 char *m_fs_name;
49 };
50
51 static inline struct ceph_entity_addr *
ceph_mdsmap_get_addr(struct ceph_mdsmap * m,int w)52 ceph_mdsmap_get_addr(struct ceph_mdsmap *m, int w)
53 {
54 if (w >= m->possible_max_rank)
55 return NULL;
56 return &m->m_info[w].addr;
57 }
58
ceph_mdsmap_get_state(struct ceph_mdsmap * m,int w)59 static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
60 {
61 BUG_ON(w < 0);
62 if (w >= m->possible_max_rank)
63 return CEPH_MDS_STATE_DNE;
64 return m->m_info[w].state;
65 }
66
ceph_mdsmap_is_laggy(struct ceph_mdsmap * m,int w)67 static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
68 {
69 if (w >= 0 && w < m->possible_max_rank)
70 return m->m_info[w].laggy;
71 return false;
72 }
73
74 extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
75 struct ceph_mdsmap *ceph_mdsmap_decode(struct ceph_mds_client *mdsc, void **p,
76 void *end, bool msgr2);
77 extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
78 extern bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m);
79
80 #endif
81