lustre/include/linux/lustre_import.h

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2001  Cluster File Systems, Inc.
   5  *
   6  * This code is issued under the GNU General Public License.
   7  * See the file COPYING in this distribution
   8  */
   9
  10 #ifndef __IMPORT_H
  11 #define __IMPORT_H
  12
  13 #include <linux/lustre_handles.h>
  14 #include <linux/lustre_idl.h>
  15
  16 enum lustre_imp_state {
  17 //        LUSTRE_IMP_INVALID    = 1,
  18         LUSTRE_IMP_NEW        = 2,
  19         LUSTRE_IMP_DISCON     = 3,
  20         LUSTRE_IMP_CONNECTING = 4,
  21         LUSTRE_IMP_REPLAY     = 5,
  22         LUSTRE_IMP_RECOVER    = 6,
  23         LUSTRE_IMP_FULL       = 7,
  24         LUSTRE_IMP_EVICTED    = 8,
  25 };
  26
  27
  28 struct obd_import {
  29         struct portals_handle     imp_handle;
  30         atomic_t                  imp_refcount;
  31         struct lustre_handle      imp_dlm_handle; /* client's ldlm export */
  32         struct ptlrpc_connection *imp_connection;
  33         struct ptlrpc_client     *imp_client;
  34         struct list_head          imp_observers;
  35         struct list_head          imp_pinger_chain;
  36
  37         /* Lists of requests that are retained for replay, waiting for a reply,
  38          * or waiting for recovery to complete, respectively.
  39          */
  40         struct list_head          imp_replay_list;
  41         struct list_head          imp_sending_list;
  42         struct list_head          imp_delayed_list;
  43
  44         struct obd_device        *imp_obd;
  45         struct semaphore          imp_recovery_sem;
  46         enum lustre_imp_state     imp_state;
  47         int                       imp_generation;
  48         __u32                     imp_conn_cnt;
  49         __u64                     imp_max_transno;
  50         __u64                     imp_peer_committed_transno;
  51         struct obd_uuid           imp_target_uuid; /* XXX -> lustre_name */
  52         struct lustre_handle      imp_remote_handle;
  53         unsigned long             imp_next_ping;
  54
  55         /* Protects flags, level, generation, conn_cnt, *_list */
  56         spinlock_t                imp_lock;
  57
  58         /* flags */
  59         int                       imp_invalid:1, imp_replayable:1,
  60                                   imp_dlm_fake:1, imp_server_timeout:1;
  61         __u32                     imp_connect_op;
  62 };
  63
  64 typedef void (*obd_import_callback)(struct obd_import *imp, void *closure,
  65                                     int event, void *event_arg, void *cb_data);
  66
  67 struct obd_import_observer {
  68         struct list_head     oio_chain;
  69         obd_import_callback  oio_cb;
  70         void                *oio_cb_data;
  71 };
  72
  73 void class_observe_import(struct obd_import *imp, obd_import_callback cb,
  74                           void *cb_data);
  75 void class_unobserve_import(struct obd_import *imp, obd_import_callback cb,
  76                             void *cb_data);
  77 void class_notify_import_observers(struct obd_import *imp, int event,
  78                                    void *event_arg);
  79
  80 #define IMP_EVENT_ACTIVE   1
  81 #define IMP_EVENT_INACTIVE 2
  82
  83 /* genops.c */
  84 struct obd_export;
  85 extern struct obd_import *class_exp2cliimp(struct obd_export *);
  86 extern struct obd_import *class_conn2cliimp(struct lustre_handle *);
  87
  88 #endif /* __IMPORT_H */