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_CLOSED     = 1,
  18         LUSTRE_IMP_NEW        = 2,
  19         LUSTRE_IMP_DISCON     = 3,
  20         LUSTRE_IMP_CONNECTING = 4,
  21         LUSTRE_IMP_REPLAY     = 5,
  22         LUSTRE_IMP_REPLAY_LOCKS = 6,
  23         LUSTRE_IMP_REPLAY_WAIT  = 7,
  24         LUSTRE_IMP_RECOVER    = 8,
  25         LUSTRE_IMP_FULL       = 9,
  26         LUSTRE_IMP_EVICTED    = 10,
  27 };
  28
  29 static inline char * ptlrpc_import_state_name(enum lustre_imp_state state)
  30 {
  31
  32         static char* import_state_names[] = {
  33                 "<UNKNOWN>", "CLOSED",  "NEW", "DISCONN",
  34                 "CONNECTING", "REPLAY", "REPLAY_LOCKS", "REPLAY_WAIT",
  35                 "RECOVER", "FULL", "EVICTED",
  36         };
  37
  38         LASSERT (state <= LUSTRE_IMP_EVICTED);
  39         return import_state_names[state];
  40 }
  41
  42
  43 struct obd_import {
  44         struct portals_handle     imp_handle;
  45         atomic_t                  imp_refcount;
  46         struct lustre_handle      imp_dlm_handle; /* client's ldlm export */
  47         struct ptlrpc_connection *imp_connection;
  48         struct ptlrpc_client     *imp_client;
  49         struct list_head          imp_observers;
  50         struct list_head          imp_pinger_chain;
  51
  52         /* Lists of requests that are retained for replay, waiting for a reply,
  53          * or waiting for recovery to complete, respectively.
  54          */
  55         struct list_head          imp_replay_list;
  56         struct list_head          imp_sending_list;
  57         struct list_head          imp_delayed_list;
  58
  59         struct obd_device        *imp_obd;
  60         wait_queue_head_t         imp_recovery_waitq;
  61         __u64                     imp_last_replay_transno;
  62         atomic_t                  imp_replay_inflight;
  63         enum lustre_imp_state     imp_state;
  64         int                       imp_generation;
  65         __u32                     imp_conn_cnt;
  66         __u64                     imp_max_transno;
  67         __u64                     imp_peer_committed_transno;
  68         struct obd_uuid           imp_target_uuid; /* XXX -> lustre_name */
  69         struct lustre_handle      imp_remote_handle;
  70         unsigned long             imp_next_ping;
  71
  72         /* Protects flags, level, generation, conn_cnt, *_list */
  73         spinlock_t                imp_lock;
  74
  75         /* flags */
  76         int                       imp_invalid:1, imp_replayable:1,
  77                                   imp_dlm_fake:1, imp_server_timeout:1,
  78                                   imp_initial_recov:1;
  79         __u32                     imp_connect_op;
  80 };
  81
  82 typedef void (*obd_import_callback)(struct obd_import *imp, void *closure,
  83                                     int event, void *event_arg, void *cb_data);
  84
  85 struct obd_import_observer {
  86         struct list_head     oio_chain;
  87         obd_import_callback  oio_cb;
  88         void                *oio_cb_data;
  89 };
  90
  91 void class_observe_import(struct obd_import *imp, obd_import_callback cb,
  92                           void *cb_data);
  93 void class_unobserve_import(struct obd_import *imp, obd_import_callback cb,
  94                             void *cb_data);
  95 void class_notify_import_observers(struct obd_import *imp, int event,
  96                                    void *event_arg);
  97
  98 #define IMP_EVENT_ACTIVE   1
  99 #define IMP_EVENT_INACTIVE 2
 100
 101 /* genops.c */
 102 struct obd_export;
 103 extern struct obd_import *class_exp2cliimp(struct obd_export *);
 104 extern struct obd_import *class_conn2cliimp(struct lustre_handle *);
 105
 106 #endif /* __IMPORT_H */