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 typedef void (*ceph_monc_callback_t)(struct ceph_mon_generic_request *);
  43
  44 /*
  45  * ceph_mon_generic_request is being used for the statfs and
  46  * mon_get_version requests which are being done a bit differently
  47  * because we need to get data back to the caller
  48  */
  49 struct ceph_mon_generic_request {
  50         struct ceph_mon_client *monc;
  51         struct kref kref;
  52         u64 tid;
  53         struct rb_node node;
  54         int result;
  55
  56         struct completion completion;
  57         ceph_monc_callback_t complete_cb;
  58         u64 private_data;          /* r_tid/linger_id */
  59
  60         struct ceph_msg *request;  /* original request */
  61         struct ceph_msg *reply;    /* and reply */
  62
  63         union {
  64                 struct ceph_statfs *st;
  65                 u64 newest;
  66         } u;
  67 };
  68
  69 struct ceph_mon_client {
  70         struct ceph_client *client;
  71         struct ceph_monmap *monmap;
  72
  73         struct mutex mutex;
  74         struct delayed_work delayed_work;
  75
  76         struct ceph_auth_client *auth;
  77         struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack;
  78         int pending_auth;
  79
  80         bool hunting;
  81         int cur_mon;                       /* last monitor i contacted */
  82         unsigned long sub_renew_after;
  83         unsigned long sub_renew_sent;
  84         struct ceph_connection con;
  85
  86         bool had_a_connection;
  87         int hunt_mult; /* [1..CEPH_MONC_HUNT_MAX_MULT] */
  88
  89         /* pending generic requests */
  90         struct rb_root generic_request_tree;
  91         u64 last_tid;
  92
  93         /* subs, indexed with CEPH_SUB_* */
  94         struct {
  95                 struct ceph_mon_subscribe_item item;
  96                 bool want;
  97                 u32 have; /* epoch */
  98         } subs[4];
  99         int fs_cluster_id; /* "mdsmap.<id>" sub */
 100
 101 #ifdef CONFIG_DEBUG_FS
 102         struct dentry *debugfs_file;
 103 #endif
 104 };
 105
 106 extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
 107 extern int ceph_monmap_contains(struct ceph_monmap *m,
 108                                 struct ceph_entity_addr *addr);
 109
 110 extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
 111 extern void ceph_monc_stop(struct ceph_mon_client *monc);
 112
 113 enum {
 114         CEPH_SUB_MONMAP = 0,
 115         CEPH_SUB_OSDMAP,
 116         CEPH_SUB_FSMAP,
 117         CEPH_SUB_MDSMAP,
 118 };
 119
 120 extern const char *ceph_sub_str[];
 121
 122 /*
 123  * The model here is to indicate that we need a new map of at least
 124  * epoch @epoch, and also call in when we receive a map.  We will
 125  * periodically rerequest the map from the monitor cluster until we
 126  * get what we want.
 127  */
 128 bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
 129                         bool continuous);
 130 void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch);
 131 void ceph_monc_renew_subs(struct ceph_mon_client *monc);
 132
 133 extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
 134                                  unsigned long timeout);
 135
 136 extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
 137                                struct ceph_statfs *buf);
 138
 139 int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
 140                           u64 *newest);
 141 int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
 142                                 ceph_monc_callback_t cb, u64 private_data);
 143
 144 extern int ceph_monc_open_session(struct ceph_mon_client *monc);
 145
 146 extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
 147
 148 #endif