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 #include "msgpool.h"
  10
  11 struct ceph_client;
  12 struct ceph_mount_args;
  13 struct ceph_auth_client;
  14
  15 /*
  16  * The monitor map enumerates the set of all monitors.
  17  */
  18 struct ceph_monmap {
  19         struct ceph_fsid fsid;
  20         u32 epoch;
  21         u32 num_mon;
  22         struct ceph_entity_inst mon_inst[0];
  23 };
  24
  25 struct ceph_mon_client;
  26 struct ceph_mon_statfs_request;
  27
  28
  29 /*
  30  * Generic mechanism for resending monitor requests.
  31  */
  32 typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc,
  33                                          int newmon);
  34
  35 /* a pending monitor request */
  36 struct ceph_mon_request {
  37         struct ceph_mon_client *monc;
  38         struct delayed_work delayed_work;
  39         unsigned long delay;
  40         ceph_monc_request_func_t do_request;
  41 };
  42
  43 /*
  44  * statfs() is done a bit differently because we need to get data back
  45  * to the caller
  46  */
  47 struct ceph_mon_statfs_request {
  48         struct kref kref;
  49         u64 tid;
  50         struct rb_node node;
  51         int result;
  52         struct ceph_statfs *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;
  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         /* msg pools */
  76         struct ceph_msgpool msgpool_subscribe_ack;
  77         struct ceph_msgpool msgpool_auth_reply;
  78
  79         /* pending statfs requests */
  80         struct rb_root statfs_request_tree;
  81         int num_statfs_requests;
  82         u64 last_tid;
  83
  84         /* mds/osd map */
  85         int want_next_osdmap; /* 1 = want, 2 = want+asked */
  86         u32 have_osdmap, have_mdsmap;
  87
  88 #ifdef CONFIG_DEBUG_FS
  89         struct dentry *debugfs_file;
  90 #endif
  91 };
  92
  93 extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
  94 extern int ceph_monmap_contains(struct ceph_monmap *m,
  95                                 struct ceph_entity_addr *addr);
  96
  97 extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
  98 extern void ceph_monc_stop(struct ceph_mon_client *monc);
  99
 100 /*
 101  * The model here is to indicate that we need a new map of at least
 102  * epoch @want, and also call in when we receive a map.  We will
 103  * periodically rerequest the map from the monitor cluster until we
 104  * get what we want.
 105  */
 106 extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
 107 extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);
 108
 109 extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
 110
 111 extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
 112                                struct ceph_statfs *buf);
 113
 114 extern int ceph_monc_open_session(struct ceph_mon_client *monc);
 115
 116 extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
 117
 118
 119
 120 #endif