root/include/linux/ceph/mdsmap.h

DEFINITIONS

1. ceph_mdsmap_get_addr
2. ceph_mdsmap_get_state
3. ceph_mdsmap_is_laggy

#ifndef _FS_CEPH_MDSMAP_H
#define _FS_CEPH_MDSMAP_H

#include <linux/bug.h>
#include <linux/ceph/types.h>

/*
 * mds map - describe servers in the mds cluster.
 *
 * we limit fields to those the client actually xcares about
 */
struct ceph_mds_info {
        u64 global_id;
        struct ceph_entity_addr addr;
        s32 state;
        int num_export_targets;
        bool laggy;
        u32 *export_targets;
};

struct ceph_mdsmap {
        u32 m_epoch, m_client_epoch, m_last_failure;
        u32 m_root;
        u32 m_session_timeout;          /* seconds */
        u32 m_session_autoclose;        /* seconds */
        u64 m_max_file_size;
        u32 m_max_mds;                  /* size of m_addr, m_state arrays */
        struct ceph_mds_info *m_info;

        /* which object pools file data can be stored in */
        int m_num_data_pg_pools;
        u64 *m_data_pg_pools;
        u64 m_cas_pg_pool;
};

static inline struct ceph_entity_addr *
ceph_mdsmap_get_addr(struct ceph_mdsmap *m, int w)
{
        if (w >= m->m_max_mds)
                return NULL;
        return &m->m_info[w].addr;
}

static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
{
        BUG_ON(w < 0);
        if (w >= m->m_max_mds)
                return CEPH_MDS_STATE_DNE;
        return m->m_info[w].state;
}

static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
{
        if (w >= 0 && w < m->m_max_mds)
                return m->m_info[w].laggy;
        return false;
}

extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
extern struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end);
extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);

#endif