root/include/linux/ceph/mon_client.h

INCLUDED FROM

#ifndef _FS_CEPH_MON_CLIENT_H
#define _FS_CEPH_MON_CLIENT_H

#include <linux/completion.h>
#include <linux/kref.h>
#include <linux/rbtree.h>

#include <linux/ceph/messenger.h>

struct ceph_client;
struct ceph_mount_args;
struct ceph_auth_client;

/*
 * The monitor map enumerates the set of all monitors.
 */
struct ceph_monmap {
        struct ceph_fsid fsid;
        u32 epoch;
        u32 num_mon;
        struct ceph_entity_inst mon_inst[0];
};

struct ceph_mon_client;
struct ceph_mon_generic_request;


/*
 * Generic mechanism for resending monitor requests.
 */
typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc,
                                         int newmon);

/* a pending monitor request */
struct ceph_mon_request {
        struct ceph_mon_client *monc;
        struct delayed_work delayed_work;
        unsigned long delay;
        ceph_monc_request_func_t do_request;
};

/*
 * ceph_mon_generic_request is being used for the statfs, poolop and
 * mon_get_version requests which are being done a bit differently
 * because we need to get data back to the caller
 */
struct ceph_mon_generic_request {
        struct kref kref;
        u64 tid;
        struct rb_node node;
        int result;
        void *buf;
        int buf_len;
        struct completion completion;
        struct ceph_msg *request;  /* original request */
        struct ceph_msg *reply;    /* and reply */
};

struct ceph_mon_client {
        struct ceph_client *client;
        struct ceph_monmap *monmap;

        struct mutex mutex;
        struct delayed_work delayed_work;

        struct ceph_auth_client *auth;
        struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack;
        int pending_auth;

        bool hunting;
        int cur_mon;                       /* last monitor i contacted */
        unsigned long sub_sent, sub_renew_after;
        struct ceph_connection con;

        /* pending generic requests */
        struct rb_root generic_request_tree;
        int num_generic_requests;
        u64 last_tid;

        /* mds/osd map */
        int want_mdsmap;
        int want_next_osdmap; /* 1 = want, 2 = want+asked */
        u32 have_osdmap, have_mdsmap;

#ifdef CONFIG_DEBUG_FS
        struct dentry *debugfs_file;
#endif
};

extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
extern int ceph_monmap_contains(struct ceph_monmap *m,
                                struct ceph_entity_addr *addr);

extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
extern void ceph_monc_stop(struct ceph_mon_client *monc);

/*
 * The model here is to indicate that we need a new map of at least
 * epoch @want, and also call in when we receive a map.  We will
 * periodically rerequest the map from the monitor cluster until we
 * get what we want.
 */
extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);

extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
                                 unsigned long timeout);

extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
                               struct ceph_statfs *buf);

extern int ceph_monc_do_get_version(struct ceph_mon_client *monc,
                                    const char *what, u64 *newest);

extern int ceph_monc_open_session(struct ceph_mon_client *monc);

extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);

extern int ceph_monc_create_snapid(struct ceph_mon_client *monc,
                                   u32 pool, u64 *snapid);

extern int ceph_monc_delete_snapid(struct ceph_mon_client *monc,
                                   u32 pool, u64 snapid);

#endif