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 "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         int buf_len;
  54         struct completion completion;
  55         struct ceph_msg *request;  /* original request */
  56         struct ceph_msg *reply;    /* and reply */
  57 };
  58
  59 struct ceph_mon_client {
  60         struct ceph_client *client;
  61         struct ceph_monmap *monmap;
  62
  63         struct mutex mutex;
  64         struct delayed_work delayed_work;
  65
  66         struct ceph_auth_client *auth;
  67         struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack;
  68         int pending_auth;
  69
  70         bool hunting;
  71         int cur_mon;                       /* last monitor i contacted */
  72         unsigned long sub_sent, sub_renew_after;
  73         struct ceph_connection *con;
  74         bool have_fsid;
  75
  76         /* pending generic requests */
  77         struct rb_root generic_request_tree;
  78         int num_generic_requests;
  79         u64 last_tid;
  80
  81         /* mds/osd map */
  82         int want_mdsmap;
  83         int want_next_osdmap; /* 1 = want, 2 = want+asked */
  84         u32 have_osdmap, have_mdsmap;
  85
  86 #ifdef CONFIG_DEBUG_FS
  87         struct dentry *debugfs_file;
  88 #endif
  89 };
  90
  91 extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
  92 extern int ceph_monmap_contains(struct ceph_monmap *m,
  93                                 struct ceph_entity_addr *addr);
  94
  95 extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
  96 extern void ceph_monc_stop(struct ceph_mon_client *monc);
  97
  98 /*
  99  * The model here is to indicate that we need a new map of at least
 100  * epoch @want, and also call in when we receive a map.  We will
 101  * periodically rerequest the map from the monitor cluster until we
 102  * get what we want.
 103  */
 104 extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
 105 extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);
 106
 107 extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
 108
 109 extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
 110                                struct ceph_statfs *buf);
 111
 112 extern int ceph_monc_open_session(struct ceph_mon_client *monc);
 113
 114 extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
 115
 116 extern int ceph_monc_create_snapid(struct ceph_mon_client *monc,
 117                                    u32 pool, u64 *snapid);
 118
 119 extern int ceph_monc_delete_snapid(struct ceph_mon_client *monc,
 120                                    u32 pool, u64 snapid);
 121
 122 #endif