LXR linux/include/linux/ceph/mon

   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 <linux/ceph/messenger.h>
   9
  10struct ceph_client;
  11struct ceph_mount_args;
  12struct ceph_auth_client;
  13
  14/*
  15 * The monitor map enumerates the set of all monitors.
  16 */
  17struct ceph_monmap {
  18        struct ceph_fsid fsid;
  19        u32 epoch;
  20        u32 num_mon;
  21        struct ceph_entity_inst mon_inst[0];
  22};
  23
  24struct ceph_mon_client;
  25struct ceph_mon_generic_request;
  26
  27
  28/*
  29 * Generic mechanism for resending monitor requests.
  30 */
  31typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc,
  32                                         int newmon);
  33
  34/* a pending monitor request */
  35struct 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
  42typedef void (*ceph_monc_callback_t)(struct ceph_mon_generic_request *);
  43
  44/*
  45 * ceph_mon_generic_request is being used for the statfs and
  46 * mon_get_version requests which are being done a bit differently
  47 * because we need to get data back to the caller
  48 */
  49struct ceph_mon_generic_request {
  50        struct ceph_mon_client *monc;
  51        struct kref kref;
  52        u64 tid;
  53        struct rb_node node;
  54        int result;
  55
  56        struct completion completion;
  57        ceph_monc_callback_t complete_cb;
  58        u64 private_data;          /* r_tid/linger_id */
  59
  60        struct ceph_msg *request;  /* original request */
  61        struct ceph_msg *reply;    /* and reply */
  62
  63        union {
  64                struct ceph_statfs *st;
  65                u64 newest;
  66        } u;
  67};
  68
  69struct ceph_mon_client {
  70        struct ceph_client *client;
  71        struct ceph_monmap *monmap;
  72
  73        struct mutex mutex;
  74        struct delayed_work delayed_work;
  75
  76        struct ceph_auth_client *auth;
  77        struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack;
  78        int pending_auth;
  79
  80        bool hunting;
  81        int cur_mon;                       /* last monitor i contacted */
  82        unsigned long sub_renew_after;
  83        unsigned long sub_renew_sent;
  84        struct ceph_connection con;
  85
  86        bool had_a_connection;
  87        int hunt_mult; /* [1..CEPH_MONC_HUNT_MAX_MULT] */
  88
  89        /* pending generic requests */
  90        struct rb_root generic_request_tree;
  91        u64 last_tid;
  92
  93        /* subs, indexed with CEPH_SUB_* */
  94        struct {
  95                struct ceph_mon_subscribe_item item;
  96                bool want;
  97                u32 have; /* epoch */
  98        } subs[4];
  99        int fs_cluster_id; /* "mdsmap.<id>" sub */
 100
 101#ifdef CONFIG_DEBUG_FS
 102        struct dentry *debugfs_file;
 103#endif
 104};
 105
 106extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
 107extern int ceph_monmap_contains(struct ceph_monmap *m,
 108                                struct ceph_entity_addr *addr);
 109
 110extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
 111extern void ceph_monc_stop(struct ceph_mon_client *monc);
 112
 113enum {
 114        CEPH_SUB_MONMAP = 0,
 115        CEPH_SUB_OSDMAP,
 116        CEPH_SUB_FSMAP,
 117        CEPH_SUB_MDSMAP,
 118};
 119
 120extern const char *ceph_sub_str[];
 121
 122/*
 123 * The model here is to indicate that we need a new map of at least
 124 * epoch @epoch, and also call in when we receive a map.  We will
 125 * periodically rerequest the map from the monitor cluster until we
 126 * get what we want.
 127 */
 128bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
 129                        bool continuous);
 130void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch);
 131void ceph_monc_renew_subs(struct ceph_mon_client *monc);
 132
 133extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
 134                                 unsigned long timeout);
 135
 136extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
 137                               struct ceph_statfs *buf);
 138
 139int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
 140                          u64 *newest);
 141int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
 142                                ceph_monc_callback_t cb, u64 private_data);
 143
 144int ceph_monc_blacklist_add(struct ceph_mon_client *monc,
 145                            struct ceph_entity_addr *client_addr);
 146
 147extern int ceph_monc_open_session(struct ceph_mon_client *monc);
 148
 149extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
 150
 151#endif
 152