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 enum obd_import_event {
  43         IMP_EVENT_DISCON     = 0x808001,
  44         IMP_EVENT_INACTIVE   = 0x808002,
  45         IMP_EVENT_INVALIDATE = 0x808003,
  46         IMP_EVENT_ACTIVE     = 0x808004,
  47 };
  48
  49 struct obd_import_conn {
  50         struct list_head          oic_item;
  51         struct ptlrpc_connection *oic_conn;
  52         struct obd_uuid           oic_uuid;
  53         unsigned long             oic_last_attempt; /* in jiffies */
  54 };
  55
  56
  57 struct obd_import {
  58         struct portals_handle     imp_handle;
  59         atomic_t                  imp_refcount;
  60         struct lustre_handle      imp_dlm_handle; /* client's ldlm export */
  61         struct ptlrpc_connection *imp_connection;
  62         struct ptlrpc_client     *imp_client;
  63         struct list_head          imp_observers;
  64         struct list_head          imp_pinger_chain;
  65
  66         /* Lists of requests that are retained for replay, waiting for a reply,
  67          * or waiting for recovery to complete, respectively.
  68          */
  69         struct list_head          imp_replay_list;
  70         struct list_head          imp_sending_list;
  71         struct list_head          imp_delayed_list;
  72
  73         struct obd_device        *imp_obd;
  74         wait_queue_head_t         imp_recovery_waitq;
  75         __u64                     imp_last_replay_transno;
  76         atomic_t                  imp_inflight;
  77         atomic_t                  imp_replay_inflight;
  78         enum lustre_imp_state     imp_state;
  79         int                       imp_generation;
  80         __u32                     imp_conn_cnt;
  81         __u64                     imp_max_transno;
  82         __u64                     imp_peer_committed_transno;
  83         struct obd_uuid           imp_target_uuid; /* XXX -> lustre_name */
  84         struct lustre_handle      imp_remote_handle;
  85         unsigned long             imp_next_ping;
  86         unsigned long             imp_connect_start;
  87
  88         /* all available obd_import_conn linked here */
  89         struct list_head          imp_conn_list;
  90         struct obd_import_conn   *imp_conn_current;
  91
  92         /* Protects flags, level, generation, conn_cnt, *_list */
  93         spinlock_t                imp_lock;
  94
  95         /* flags */
  96         int                       imp_invalid:1, imp_replayable:1,
  97                                   imp_dlm_fake:1, imp_server_timeout:1,
  98                                   imp_initial_recov:1, imp_force_verify:1,
  99                                   imp_pingable:1, imp_resend_replay:1;
 100         __u32                     imp_connect_op;
 101         __u32                     imp_connect_flags;
 102 };
 103
 104 typedef void (*obd_import_callback)(struct obd_import *imp, void *closure,
 105                                     int event, void *event_arg, void *cb_data);
 106
 107 struct obd_import_observer {
 108         struct list_head     oio_chain;
 109         obd_import_callback  oio_cb;
 110         void                *oio_cb_data;
 111 };
 112
 113 void class_observe_import(struct obd_import *imp, obd_import_callback cb,
 114                           void *cb_data);
 115 void class_unobserve_import(struct obd_import *imp, obd_import_callback cb,
 116                             void *cb_data);
 117 void class_notify_import_observers(struct obd_import *imp, int event,
 118                                    void *event_arg);
 119
 120 #define IMP_EVENT_ACTIVE   1
 121 #define IMP_EVENT_INACTIVE 2
 122
 123 /* genops.c */
 124 struct obd_export;
 125 extern struct obd_import *class_exp2cliimp(struct obd_export *);
 126 extern struct obd_import *class_conn2cliimp(struct lustre_handle *);
 127
 128 #endif /* __IMPORT_H */