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/rbtree.h>
   6
   7 #include "messenger.h"
   8 #include "msgpool.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_statfs_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  * statfs() is done a bit differently because we need to get data back
  44  * to the caller
  45  */
  46 struct ceph_mon_statfs_request {
  47         u64 tid;
  48         struct rb_node node;
  49         int result;
  50         struct ceph_statfs *buf;
  51         struct completion completion;
  52         unsigned long last_attempt, delay; /* jiffies */
  53         struct ceph_msg *request;  /* original request */
  54 };
  55
  56 struct ceph_mon_client {
  57         struct ceph_client *client;
  58         struct ceph_monmap *monmap;
  59
  60         struct mutex mutex;
  61         struct delayed_work delayed_work;
  62
  63         struct ceph_auth_client *auth;
  64         struct ceph_msg *m_auth;
  65         int pending_auth;
  66
  67         bool hunting;
  68         int cur_mon;                       /* last monitor i contacted */
  69         unsigned long sub_sent, sub_renew_after;
  70         struct ceph_connection *con;
  71         bool have_fsid;
  72
  73         /* msg pools */
  74         struct ceph_msgpool msgpool_subscribe_ack;
  75         struct ceph_msgpool msgpool_statfs_reply;
  76         struct ceph_msgpool msgpool_auth_reply;
  77
  78         /* pending statfs requests */
  79         struct rb_root statfs_request_tree;
  80         int num_statfs_requests;
  81         u64 last_tid;
  82
  83         /* mds/osd map */
  84         int want_next_osdmap; /* 1 = want, 2 = want+asked */
  85         u32 have_osdmap, have_mdsmap;
  86
  87 #ifdef CONFIG_DEBUG_FS
  88         struct dentry *debugfs_file;
  89 #endif
  90 };
  91
  92 extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
  93 extern int ceph_monmap_contains(struct ceph_monmap *m,
  94                                 struct ceph_entity_addr *addr);
  95
  96 extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
  97 extern void ceph_monc_stop(struct ceph_mon_client *monc);
  98
  99 /*
 100  * The model here is to indicate that we need a new map of at least
 101  * epoch @want, and also call in when we receive a map.  We will
 102  * periodically rerequest the map from the monitor cluster until we
 103  * get what we want.
 104  */
 105 extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
 106 extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);
 107
 108 extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
 109
 110 extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
 111                                struct ceph_statfs *buf);
 112
 113 extern int ceph_monc_open_session(struct ceph_mon_client *monc);
 114
 115 extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
 116
 117
 118
 119 #endif