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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _FS_CEPH_MDSMAP_H3#define _FS_CEPH_MDSMAP_H4 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 about14 */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#endif80