drivers/staging/lustre/lustre/include/lustre_import.h

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2012, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36 /** \defgroup obd_import PtlRPC import definitions
  37  * Imports are client-side representation of remote obd target.
  38  *
  39  * @{
  40  */
  41
  42 #ifndef __IMPORT_H
  43 #define __IMPORT_H
  44
  45 /** \defgroup export export
  46  *
  47  * @{
  48  */
  49
  50 #include <lustre_handles.h>
  51 #include <lustre/lustre_idl.h>
  52
  53
  54 /**
  55  * Adaptive Timeout stuff
  56  *
  57  * @{
  58  */
  59 #define D_ADAPTTO D_OTHER
  60 #define AT_BINS 4                 /* "bin" means "N seconds of history" */
  61 #define AT_FLG_NOHIST 0x1         /* use last reported value only */
  62
  63 struct adaptive_timeout {
  64         time_t          at_binstart;     /* bin start time */
  65         unsigned int    at_hist[AT_BINS];    /* timeout history bins */
  66         unsigned int    at_flags;
  67         unsigned int    at_current;       /* current timeout value */
  68         unsigned int    at_worst_ever;       /* worst-ever timeout value */
  69         time_t          at_worst_time;       /* worst-ever timeout timestamp */
  70         spinlock_t      at_lock;
  71 };
  72
  73 struct ptlrpc_at_array {
  74         struct list_head       *paa_reqs_array; /** array to hold requests */
  75         __u32        paa_size;       /** the size of array */
  76         __u32        paa_count;      /** the total count of reqs */
  77         time_t      paa_deadline;   /** the earliest deadline of reqs */
  78         __u32       *paa_reqs_count; /** the count of reqs in each entry */
  79 };
  80
  81 #define IMP_AT_MAX_PORTALS 8
  82 struct imp_at {
  83         int                  iat_portal[IMP_AT_MAX_PORTALS];
  84         struct adaptive_timeout iat_net_latency;
  85         struct adaptive_timeout iat_service_estimate[IMP_AT_MAX_PORTALS];
  86 };
  87
  88
  89 /** @} */
  90
  91 /** Possible import states */
  92 enum lustre_imp_state {
  93         LUSTRE_IMP_CLOSED     = 1,
  94         LUSTRE_IMP_NEW  = 2,
  95         LUSTRE_IMP_DISCON     = 3,
  96         LUSTRE_IMP_CONNECTING = 4,
  97         LUSTRE_IMP_REPLAY     = 5,
  98         LUSTRE_IMP_REPLAY_LOCKS = 6,
  99         LUSTRE_IMP_REPLAY_WAIT  = 7,
 100         LUSTRE_IMP_RECOVER    = 8,
 101         LUSTRE_IMP_FULL       = 9,
 102         LUSTRE_IMP_EVICTED    = 10,
 103 };
 104
 105 /** Returns test string representation of numeric import state \a state */
 106 static inline char * ptlrpc_import_state_name(enum lustre_imp_state state)
 107 {
 108         static char* import_state_names[] = {
 109                 "<UNKNOWN>", "CLOSED",  "NEW", "DISCONN",
 110                 "CONNECTING", "REPLAY", "REPLAY_LOCKS", "REPLAY_WAIT",
 111                 "RECOVER", "FULL", "EVICTED",
 112         };
 113
 114         LASSERT (state <= LUSTRE_IMP_EVICTED);
 115         return import_state_names[state];
 116 }
 117
 118 /**
 119  * List of import event types
 120  */
 121 enum obd_import_event {
 122         IMP_EVENT_DISCON     = 0x808001,
 123         IMP_EVENT_INACTIVE   = 0x808002,
 124         IMP_EVENT_INVALIDATE = 0x808003,
 125         IMP_EVENT_ACTIVE     = 0x808004,
 126         IMP_EVENT_OCD   = 0x808005,
 127         IMP_EVENT_DEACTIVATE = 0x808006,
 128         IMP_EVENT_ACTIVATE   = 0x808007,
 129 };
 130
 131 /**
 132  * Definition of import connection structure
 133  */
 134 struct obd_import_conn {
 135         /** Item for linking connections together */
 136         struct list_head                oic_item;
 137         /** Pointer to actual PortalRPC connection */
 138         struct ptlrpc_connection *oic_conn;
 139         /** uuid of remote side */
 140         struct obd_uuid    oic_uuid;
 141         /**
 142          * Time (64 bit jiffies) of last connection attempt on this connection
 143          */
 144         __u64                oic_last_attempt;
 145 };
 146
 147 /* state history */
 148 #define IMP_STATE_HIST_LEN 16
 149 struct import_state_hist {
 150         enum lustre_imp_state ish_state;
 151         time_t          ish_time;
 152 };
 153
 154 /**
 155  * Defintion of PortalRPC import structure.
 156  * Imports are representing client-side view to remote target.
 157  */
 158 struct obd_import {
 159         /** Local handle (== id) for this import. */
 160         struct portals_handle     imp_handle;
 161         /** Reference counter */
 162         atomic_t              imp_refcount;
 163         struct lustre_handle      imp_dlm_handle; /* client's ldlm export */
 164         /** Currently active connection */
 165         struct ptlrpc_connection *imp_connection;
 166         /** PortalRPC client structure for this import */
 167         struct ptlrpc_client     *imp_client;
 168         /** List element for linking into pinger chain */
 169         struct list_head                imp_pinger_chain;
 170         /** List element for linking into chain for destruction */
 171         struct list_head                imp_zombie_chain;
 172
 173         /**
 174          * Lists of requests that are retained for replay, waiting for a reply,
 175          * or waiting for recovery to complete, respectively.
 176          * @{
 177          */
 178         struct list_head                imp_replay_list;
 179         struct list_head                imp_sending_list;
 180         struct list_head                imp_delayed_list;
 181         /** @} */
 182
 183         /**
 184          * List of requests that are retained for committed open replay. Once
 185          * open is committed, open replay request will be moved from the
 186          * imp_replay_list into the imp_committed_list.
 187          * The imp_replay_cursor is for accelerating searching during replay.
 188          * @{
 189          */
 190         struct list_head                imp_committed_list;
 191         struct list_head               *imp_replay_cursor;
 192         /** @} */
 193
 194         /** obd device for this import */
 195         struct obd_device       *imp_obd;
 196
 197         /**
 198          * some seciruty-related fields
 199          * @{
 200          */
 201         struct ptlrpc_sec       *imp_sec;
 202         struct mutex              imp_sec_mutex;
 203         cfs_time_t              imp_sec_expire;
 204         /** @} */
 205
 206         /** Wait queue for those who need to wait for recovery completion */
 207         wait_queue_head_t              imp_recovery_waitq;
 208
 209         /** Number of requests currently in-flight */
 210         atomic_t              imp_inflight;
 211         /** Number of requests currently unregistering */
 212         atomic_t              imp_unregistering;
 213         /** Number of replay requests inflight */
 214         atomic_t              imp_replay_inflight;
 215         /** Number of currently happening import invalidations */
 216         atomic_t              imp_inval_count;
 217         /** Numbner of request timeouts */
 218         atomic_t              imp_timeouts;
 219         /** Current import state */
 220         enum lustre_imp_state     imp_state;
 221         /** History of import states */
 222         struct import_state_hist  imp_state_hist[IMP_STATE_HIST_LEN];
 223         int                    imp_state_hist_idx;
 224         /** Current import generation. Incremented on every reconnect */
 225         int                    imp_generation;
 226         /** Incremented every time we send reconnection request */
 227         __u32                imp_conn_cnt;
 228        /**
 229         * \see ptlrpc_free_committed remembers imp_generation value here
 230         * after a check to save on unnecessary replay list iterations
 231         */
 232         int                    imp_last_generation_checked;
 233         /** Last tranno we replayed */
 234         __u64                imp_last_replay_transno;
 235         /** Last transno committed on remote side */
 236         __u64                imp_peer_committed_transno;
 237         /**
 238          * \see ptlrpc_free_committed remembers last_transno since its last
 239          * check here and if last_transno did not change since last run of
 240          * ptlrpc_free_committed and import generation is the same, we can
 241          * skip looking for requests to remove from replay list as optimisation
 242          */
 243         __u64                imp_last_transno_checked;
 244         /**
 245          * Remote export handle. This is how remote side knows what export
 246          * we are talking to. Filled from response to connect request
 247          */
 248         struct lustre_handle      imp_remote_handle;
 249         /** When to perform next ping. time in jiffies. */
 250         cfs_time_t              imp_next_ping;
 251         /** When we last succesfully connected. time in 64bit jiffies */
 252         __u64                imp_last_success_conn;
 253
 254         /** List of all possible connection for import. */
 255         struct list_head                imp_conn_list;
 256         /**
 257          * Current connection. \a imp_connection is imp_conn_current->oic_conn
 258          */
 259         struct obd_import_conn   *imp_conn_current;
 260
 261         /** Protects flags, level, generation, conn_cnt, *_list */
 262         spinlock_t                imp_lock;
 263
 264         /* flags */
 265         unsigned long        imp_no_timeout:1, /* timeouts are disabled */
 266                                   imp_invalid:1,    /* evicted */
 267                                   /* administratively disabled */
 268                                   imp_deactive:1,
 269                                   /* try to recover the import */
 270                                   imp_replayable:1,
 271                                   /* don't run recovery (timeout instead) */
 272                                   imp_dlm_fake:1,
 273                                   /* use 1/2 timeout on MDS' OSCs */
 274                                   imp_server_timeout:1,
 275                                   /* VBR: imp in delayed recovery */
 276                                   imp_delayed_recovery:1,
 277                                   /* VBR: if gap was found then no lock replays
 278                                    */
 279                                   imp_no_lock_replay:1,
 280                                   /* recovery by versions was failed */
 281                                   imp_vbr_failed:1,
 282                                   /* force an immidiate ping */
 283                                   imp_force_verify:1,
 284                                   /* force a scheduled ping */
 285                                   imp_force_next_verify:1,
 286                                   /* pingable */
 287                                   imp_pingable:1,
 288                                   /* resend for replay */
 289                                   imp_resend_replay:1,
 290                                   /* disable normal recovery, for test only. */
 291                                   imp_no_pinger_recover:1,
 292                                   /* need IR MNE swab */
 293                                   imp_need_mne_swab:1,
 294                                   /* import must be reconnected instead of
 295                                    * chouse new connection */
 296                                   imp_force_reconnect:1,
 297                                   /* import has tried to connect with server */
 298                                   imp_connect_tried:1;
 299         __u32                imp_connect_op;
 300         struct obd_connect_data   imp_connect_data;
 301         __u64                imp_connect_flags_orig;
 302         int                    imp_connect_error;
 303
 304         __u32                imp_msg_magic;
 305         __u32                imp_msghdr_flags;       /* adjusted based on server capability */
 306
 307         struct ptlrpc_request_pool *imp_rq_pool;          /* emergency request pool */
 308
 309         struct imp_at        imp_at;             /* adaptive timeout data */
 310         time_t              imp_last_reply_time;    /* for health check */
 311 };
 312
 313 typedef void (*obd_import_callback)(struct obd_import *imp, void *closure,
 314                                     int event, void *event_arg, void *cb_data);
 315
 316 /**
 317  * Structure for import observer.
 318  * It is possible to register "observer" on an import and every time
 319  * something happens to an import (like connect/evict/disconnect)
 320  * obderver will get its callback called with event type
 321  */
 322 struct obd_import_observer {
 323         struct list_head           oio_chain;
 324         obd_import_callback  oio_cb;
 325         void            *oio_cb_data;
 326 };
 327
 328 void class_observe_import(struct obd_import *imp, obd_import_callback cb,
 329                           void *cb_data);
 330 void class_unobserve_import(struct obd_import *imp, obd_import_callback cb,
 331                             void *cb_data);
 332 void class_notify_import_observers(struct obd_import *imp, int event,
 333                                    void *event_arg);
 334
 335 /* import.c */
 336 static inline unsigned int at_est2timeout(unsigned int val)
 337 {
 338         /* add an arbitrary minimum: 125% +5 sec */
 339         return (val + (val >> 2) + 5);
 340 }
 341
 342 static inline unsigned int at_timeout2est(unsigned int val)
 343 {
 344         /* restore estimate value from timeout: e=4/5(t-5) */
 345         LASSERT(val);
 346         return (max((val << 2) / 5, 5U) - 4);
 347 }
 348
 349 static inline void at_reset(struct adaptive_timeout *at, int val) {
 350         spin_lock(&at->at_lock);
 351         at->at_current = val;
 352         at->at_worst_ever = val;
 353         at->at_worst_time = cfs_time_current_sec();
 354         spin_unlock(&at->at_lock);
 355 }
 356 static inline void at_init(struct adaptive_timeout *at, int val, int flags) {
 357         memset(at, 0, sizeof(*at));
 358         spin_lock_init(&at->at_lock);
 359         at->at_flags = flags;
 360         at_reset(at, val);
 361 }
 362 extern unsigned int at_min;
 363 static inline int at_get(struct adaptive_timeout *at) {
 364         return (at->at_current > at_min) ? at->at_current : at_min;
 365 }
 366 int at_measured(struct adaptive_timeout *at, unsigned int val);
 367 int import_at_get_index(struct obd_import *imp, int portal);
 368 extern unsigned int at_max;
 369 #define AT_OFF (at_max == 0)
 370
 371 /* genops.c */
 372 struct obd_export;
 373 extern struct obd_import *class_exp2cliimp(struct obd_export *);
 374 extern struct obd_import *class_conn2cliimp(struct lustre_handle *);
 375
 376 /** @} import */
 377
 378 #endif /* __IMPORT_H */
 379
 380 /** @} obd_import */