#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 "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 and poolop requests
   * which are bening 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;

  	bool have_fsid;

  	/* 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_do_statfs(struct ceph_mon_client *monc,
  			       struct ceph_statfs *buf);

  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