include/linux/ceph/mon_client.h

   1 #ifndef _FS_CEPH_MON_CLIENT_H
   2 #define _FS_CEPH_MON_CLIENT_H
   3
   4 #include <linux/completion.h>
   5 #include <linux/kref.h>
   6 #include <linux/rbtree.h>
   7
   8 #include <linux/ceph/messenger.h>
   9
  10 struct ceph_client;
  11 struct ceph_mount_args;
  12 struct ceph_auth_client;
  13
  14 /*
  15  * The monitor map enumerates the set of all monitors.
  16  */
  17 struct ceph_monmap {
  18         struct ceph_fsid fsid;
  19         u32 epoch;
  20         u32 num_mon;
  21         struct ceph_entity_inst mon_inst[0];
  22 };
  23
  24 struct ceph_mon_client;
  25 struct ceph_mon_generic_request;
  26
  27
  28 /*
  29  * Generic mechanism for resending monitor requests.
  30  */
  31 typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc,
  32                                          int newmon);
  33
  34 /* a pending monitor request */
  35 struct ceph_mon_request {
  36         struct ceph_mon_client *monc;
  37         struct delayed_work delayed_work;
  38         unsigned long delay;
  39         ceph_monc_request_func_t do_request;
  40 };
  41
  42 /*
  43  * ceph_mon_generic_request is being used for the statfs and
  44  * mon_get_version requests which are being done a bit differently
  45  * because we need to get data back to the caller
  46  */
  47 struct ceph_mon_generic_request {
  48         struct kref kref;
  49         u64 tid;
  50         struct rb_node node;
  51         int result;
  52         void *buf;
  53         struct completion completion;
  54         struct ceph_msg *request;  /* original request */
  55         struct ceph_msg *reply;    /* and reply */
  56 };
  57
  58 struct ceph_mon_client {
  59         struct ceph_client *client;
  60         struct ceph_monmap *monmap;
  61
  62         struct mutex mutex;
  63         struct delayed_work delayed_work;
  64
  65         struct ceph_auth_client *auth;
  66         struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack;
  67         int pending_auth;
  68
  69         bool hunting;
  70         int cur_mon;                       /* last monitor i contacted */
  71         unsigned long sub_renew_after;
  72         unsigned long sub_renew_sent;
  73         struct ceph_connection con;
  74
  75         bool had_a_connection;
  76         int hunt_mult; /* [1..CEPH_MONC_HUNT_MAX_MULT] */
  77
  78         /* pending generic requests */
  79         struct rb_root generic_request_tree;
  80         u64 last_tid;
  81
  82         /* subs, indexed with CEPH_SUB_* */
  83         struct {
  84                 struct ceph_mon_subscribe_item item;
  85                 bool want;
  86                 u32 have; /* epoch */
  87         } subs[3];
  88
  89 #ifdef CONFIG_DEBUG_FS
  90         struct dentry *debugfs_file;
  91 #endif
  92 };
  93
  94 extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
  95 extern int ceph_monmap_contains(struct ceph_monmap *m,
  96                                 struct ceph_entity_addr *addr);
  97
  98 extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
  99 extern void ceph_monc_stop(struct ceph_mon_client *monc);
 100
 101 enum {
 102         CEPH_SUB_MDSMAP = 0,
 103         CEPH_SUB_MONMAP,
 104         CEPH_SUB_OSDMAP,
 105 };
 106
 107 extern const char *ceph_sub_str[];
 108
 109 /*
 110  * The model here is to indicate that we need a new map of at least
 111  * epoch @epoch, and also call in when we receive a map.  We will
 112  * periodically rerequest the map from the monitor cluster until we
 113  * get what we want.
 114  */
 115 bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
 116                         bool continuous);
 117 void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch);
 118
 119 extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
 120 extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
 121                                  unsigned long timeout);
 122
 123 extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
 124                                struct ceph_statfs *buf);
 125
 126 extern int ceph_monc_do_get_version(struct ceph_mon_client *monc,
 127                                     const char *what, u64 *newest);
 128
 129 extern int ceph_monc_open_session(struct ceph_mon_client *monc);
 130
 131 extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
 132
 133 #endif