fs/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 "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 poolop requests
  44  * which are bening done a bit differently because we need to get data back
  45  * 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_sent, sub_renew_after;
  72         struct ceph_connection *con;
  73         bool have_fsid;
  74
  75         /* pending generic requests */
  76         struct rb_root generic_request_tree;
  77         int num_generic_requests;
  78         u64 last_tid;
  79
  80         /* mds/osd map */
  81         int want_next_osdmap; /* 1 = want, 2 = want+asked */
  82         u32 have_osdmap, have_mdsmap;
  83
  84 #ifdef CONFIG_DEBUG_FS
  85         struct dentry *debugfs_file;
  86 #endif
  87 };
  88
  89 extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
  90 extern int ceph_monmap_contains(struct ceph_monmap *m,
  91                                 struct ceph_entity_addr *addr);
  92
  93 extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
  94 extern void ceph_monc_stop(struct ceph_mon_client *monc);
  95
  96 /*
  97  * The model here is to indicate that we need a new map of at least
  98  * epoch @want, and also call in when we receive a map.  We will
  99  * periodically rerequest the map from the monitor cluster until we
 100  * get what we want.
 101  */
 102 extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
 103 extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);
 104
 105 extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
 106
 107 extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
 108                                struct ceph_statfs *buf);
 109
 110 extern int ceph_monc_open_session(struct ceph_mon_client *monc);
 111
 112 extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
 113
 114
 115
 116 #endif