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/radix-tree.h>
   6
   7 #include "messenger.h"
   8 #include "msgpool.h"
   9
  10 struct ceph_client;
  11 struct ceph_mount_args;
  12
  13 /*
  14  * The monitor map enumerates the set of all monitors.
  15  */
  16 struct ceph_monmap {
  17         struct ceph_fsid fsid;
  18         u32 epoch;
  19         u32 num_mon;
  20         struct ceph_entity_inst mon_inst[0];
  21 };
  22
  23 struct ceph_mon_client;
  24 struct ceph_mon_statfs_request;
  25
  26
  27 /*
  28  * Generic mechanism for resending monitor requests.
  29  */
  30 typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc,
  31                                          int newmon);
  32
  33 /* a pending monitor request */
  34 struct ceph_mon_request {
  35         struct ceph_mon_client *monc;
  36         struct delayed_work delayed_work;
  37         unsigned long delay;
  38         ceph_monc_request_func_t do_request;
  39 };
  40
  41 /*
  42  * statfs() is done a bit differently because we need to get data back
  43  * to the caller
  44  */
  45 struct ceph_mon_statfs_request {
  46         u64 tid;
  47         int result;
  48         struct ceph_statfs *buf;
  49         struct completion completion;
  50         unsigned long last_attempt, delay; /* jiffies */
  51         struct ceph_msg *request;  /* original request */
  52 };
  53
  54 struct ceph_mon_client {
  55         struct ceph_client *client;
  56         struct ceph_monmap *monmap;
  57
  58         struct mutex mutex;
  59         struct delayed_work delayed_work;
  60
  61         bool hunting;
  62         int cur_mon;                       /* last monitor i contacted */
  63         unsigned long sub_sent, sub_renew_after;
  64         struct ceph_connection *con;
  65
  66         /* msg pools */
  67         struct ceph_msgpool msgpool_mount_ack;
  68         struct ceph_msgpool msgpool_subscribe_ack;
  69         struct ceph_msgpool msgpool_statfs_reply;
  70
  71         /* pending statfs requests */
  72         struct radix_tree_root statfs_request_tree;
  73         int num_statfs_requests;
  74         u64 last_tid;
  75
  76         /* mds/osd map or mount requests */
  77         bool want_mount;
  78         int want_next_osdmap; /* 1 = want, 2 = want+asked */
  79         u32 have_osdmap, have_mdsmap;
  80
  81 #ifdef CONFIG_DEBUG_FS
  82         struct dentry *debugfs_file;
  83 #endif
  84 };
  85
  86 extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
  87 extern int ceph_monmap_contains(struct ceph_monmap *m,
  88                                 struct ceph_entity_addr *addr);
  89
  90 extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
  91 extern void ceph_monc_stop(struct ceph_mon_client *monc);
  92
  93 /*
  94  * The model here is to indicate that we need a new map of at least
  95  * epoch @want, and also call in when we receive a map.  We will
  96  * periodically rerequest the map from the monitor cluster until we
  97  * get what we want.
  98  */
  99 extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
 100 extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);
 101
 102 extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
 103
 104 extern int ceph_monc_request_mount(struct ceph_mon_client *monc);
 105
 106 extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
 107                                struct ceph_statfs *buf);
 108
 109
 110
 111 #endif