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   1 /*
   2  * zfcp device driver
   3  *
   4  * Error Recovery Procedures (ERP).
   5  *
   6  * Copyright IBM Corporation 2002, 2009
   7  */
   8
   9 #define KMSG_COMPONENT "zfcp"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include "zfcp_ext.h"
  13
  14 #define ZFCP_MAX_ERPS                   3
  15
  16 enum zfcp_erp_act_flags {
  17         ZFCP_STATUS_ERP_TIMEDOUT        = 0x10000000,
  18         ZFCP_STATUS_ERP_CLOSE_ONLY      = 0x01000000,
  19         ZFCP_STATUS_ERP_DISMISSING      = 0x00100000,
  20         ZFCP_STATUS_ERP_DISMISSED       = 0x00200000,
  21         ZFCP_STATUS_ERP_LOWMEM          = 0x00400000,
  22 };
  23
  24 enum zfcp_erp_steps {
  25         ZFCP_ERP_STEP_UNINITIALIZED     = 0x0000,
  26         ZFCP_ERP_STEP_FSF_XCONFIG       = 0x0001,
  27         ZFCP_ERP_STEP_PHYS_PORT_CLOSING = 0x0010,
  28         ZFCP_ERP_STEP_PORT_CLOSING      = 0x0100,
  29         ZFCP_ERP_STEP_NAMESERVER_LOOKUP = 0x0400,
  30         ZFCP_ERP_STEP_PORT_OPENING      = 0x0800,
  31         ZFCP_ERP_STEP_UNIT_CLOSING      = 0x1000,
  32         ZFCP_ERP_STEP_UNIT_OPENING      = 0x2000,
  33 };
  34
  35 enum zfcp_erp_act_type {
  36         ZFCP_ERP_ACTION_REOPEN_UNIT        = 1,
  37         ZFCP_ERP_ACTION_REOPEN_PORT        = 2,
  38         ZFCP_ERP_ACTION_REOPEN_PORT_FORCED = 3,
  39         ZFCP_ERP_ACTION_REOPEN_ADAPTER     = 4,
  40 };
  41
  42 enum zfcp_erp_act_state {
  43         ZFCP_ERP_ACTION_RUNNING = 1,
  44         ZFCP_ERP_ACTION_READY   = 2,
  45 };
  46
  47 enum zfcp_erp_act_result {
  48         ZFCP_ERP_SUCCEEDED = 0,
  49         ZFCP_ERP_FAILED    = 1,
  50         ZFCP_ERP_CONTINUES = 2,
  51         ZFCP_ERP_EXIT      = 3,
  52         ZFCP_ERP_DISMISSED = 4,
  53         ZFCP_ERP_NOMEM     = 5,
  54 };
  55
  56 static void zfcp_erp_adapter_block(struct zfcp_adapter *adapter, int mask)
  57 {
  58         zfcp_erp_modify_adapter_status(adapter, "erablk1", NULL,
  59                                        ZFCP_STATUS_COMMON_UNBLOCKED | mask,
  60                                        ZFCP_CLEAR);
  61 }
  62
  63 static int zfcp_erp_action_exists(struct zfcp_erp_action *act)
  64 {
  65         struct zfcp_erp_action *curr_act;
  66
  67         list_for_each_entry(curr_act, &act->adapter->erp_running_head, list)
  68                 if (act == curr_act)
  69                         return ZFCP_ERP_ACTION_RUNNING;
  70         return 0;
  71 }
  72
  73 static void zfcp_erp_action_ready(struct zfcp_erp_action *act)
  74 {
  75         struct zfcp_adapter *adapter = act->adapter;
  76
  77         list_move(&act->list, &act->adapter->erp_ready_head);
  78         zfcp_rec_dbf_event_action("erardy1", act);
  79         up(&adapter->erp_ready_sem);
  80         zfcp_rec_dbf_event_thread("erardy2", adapter);
  81 }
  82
  83 static void zfcp_erp_action_dismiss(struct zfcp_erp_action *act)
  84 {
  85         act->status |= ZFCP_STATUS_ERP_DISMISSED;
  86         if (zfcp_erp_action_exists(act) == ZFCP_ERP_ACTION_RUNNING)
  87                 zfcp_erp_action_ready(act);
  88 }
  89
  90 static void zfcp_erp_action_dismiss_unit(struct zfcp_unit *unit)
  91 {
  92         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
  93                 zfcp_erp_action_dismiss(&unit->erp_action);
  94 }
  95
  96 static void zfcp_erp_action_dismiss_port(struct zfcp_port *port)
  97 {
  98         struct zfcp_unit *unit;
  99
 100         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 101                 zfcp_erp_action_dismiss(&port->erp_action);
 102         else
 103                 list_for_each_entry(unit, &port->unit_list_head, list)
 104                     zfcp_erp_action_dismiss_unit(unit);
 105 }
 106
 107 static void zfcp_erp_action_dismiss_adapter(struct zfcp_adapter *adapter)
 108 {
 109         struct zfcp_port *port;
 110
 111         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_INUSE)
 112                 zfcp_erp_action_dismiss(&adapter->erp_action);
 113         else
 114                 list_for_each_entry(port, &adapter->port_list_head, list)
 115                     zfcp_erp_action_dismiss_port(port);
 116 }
 117
 118 static int zfcp_erp_required_act(int want, struct zfcp_adapter *adapter,
 119                                  struct zfcp_port *port,
 120                                  struct zfcp_unit *unit)
 121 {
 122         int need = want;
 123         int u_status, p_status, a_status;
 124
 125         switch (want) {
 126         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 127                 u_status = atomic_read(&unit->status);
 128                 if (u_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 129                         return 0;
 130                 p_status = atomic_read(&port->status);
 131                 if (!(p_status & ZFCP_STATUS_COMMON_RUNNING) ||
 132                       p_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 133                         return 0;
 134                 if (!(p_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 135                         need = ZFCP_ERP_ACTION_REOPEN_PORT;
 136                 /* fall through */
 137         case ZFCP_ERP_ACTION_REOPEN_PORT:
 138         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 139                 p_status = atomic_read(&port->status);
 140                 if (p_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 141                         return 0;
 142                 a_status = atomic_read(&adapter->status);
 143                 if (!(a_status & ZFCP_STATUS_COMMON_RUNNING) ||
 144                       a_status & ZFCP_STATUS_COMMON_ERP_FAILED)
 145                         return 0;
 146                 if (!(a_status & ZFCP_STATUS_COMMON_UNBLOCKED))
 147                         need = ZFCP_ERP_ACTION_REOPEN_ADAPTER;
 148                 /* fall through */
 149         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 150                 a_status = atomic_read(&adapter->status);
 151                 if (a_status & ZFCP_STATUS_COMMON_ERP_INUSE)
 152                         return 0;
 153         }
 154
 155         return need;
 156 }
 157
 158 static struct zfcp_erp_action *zfcp_erp_setup_act(int need,
 159                                                   struct zfcp_adapter *adapter,
 160                                                   struct zfcp_port *port,
 161                                                   struct zfcp_unit *unit)
 162 {
 163         struct zfcp_erp_action *erp_action;
 164         u32 status = 0;
 165
 166         switch (need) {
 167         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 168                 zfcp_unit_get(unit);
 169                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &unit->status);
 170                 erp_action = &unit->erp_action;
 171                 if (!(atomic_read(&unit->status) & ZFCP_STATUS_COMMON_RUNNING))
 172                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 173                 break;
 174
 175         case ZFCP_ERP_ACTION_REOPEN_PORT:
 176         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 177                 zfcp_port_get(port);
 178                 zfcp_erp_action_dismiss_port(port);
 179                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &port->status);
 180                 erp_action = &port->erp_action;
 181                 if (!(atomic_read(&port->status) & ZFCP_STATUS_COMMON_RUNNING))
 182                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 183                 break;
 184
 185         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 186                 zfcp_adapter_get(adapter);
 187                 zfcp_erp_action_dismiss_adapter(adapter);
 188                 atomic_set_mask(ZFCP_STATUS_COMMON_ERP_INUSE, &adapter->status);
 189                 erp_action = &adapter->erp_action;
 190                 if (!(atomic_read(&adapter->status) &
 191                       ZFCP_STATUS_COMMON_RUNNING))
 192                         status = ZFCP_STATUS_ERP_CLOSE_ONLY;
 193                 break;
 194
 195         default:
 196                 return NULL;
 197         }
 198
 199         memset(erp_action, 0, sizeof(struct zfcp_erp_action));
 200         erp_action->adapter = adapter;
 201         erp_action->port = port;
 202         erp_action->unit = unit;
 203         erp_action->action = need;
 204         erp_action->status = status;
 205
 206         return erp_action;
 207 }
 208
 209 static int zfcp_erp_action_enqueue(int want, struct zfcp_adapter *adapter,
 210                                    struct zfcp_port *port,
 211                                    struct zfcp_unit *unit, char *id, void *ref)
 212 {
 213         int retval = 1, need;
 214         struct zfcp_erp_action *act = NULL;
 215
 216         if (!(atomic_read(&adapter->status) &
 217               ZFCP_STATUS_ADAPTER_ERP_THREAD_UP))
 218                 return -EIO;
 219
 220         need = zfcp_erp_required_act(want, adapter, port, unit);
 221         if (!need)
 222                 goto out;
 223
 224         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING, &adapter->status);
 225         act = zfcp_erp_setup_act(need, adapter, port, unit);
 226         if (!act)
 227                 goto out;
 228         ++adapter->erp_total_count;
 229         list_add_tail(&act->list, &adapter->erp_ready_head);
 230         up(&adapter->erp_ready_sem);
 231         zfcp_rec_dbf_event_thread("eracte1", adapter);
 232         retval = 0;
 233  out:
 234         zfcp_rec_dbf_event_trigger(id, ref, want, need, act,
 235                                    adapter, port, unit);
 236         return retval;
 237 }
 238
 239 static int _zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter,
 240                                     int clear_mask, char *id, void *ref)
 241 {
 242         zfcp_erp_adapter_block(adapter, clear_mask);
 243         zfcp_scsi_schedule_rports_block(adapter);
 244
 245         /* ensure propagation of failed status to new devices */
 246         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 247                 zfcp_erp_adapter_failed(adapter, "erareo1", NULL);
 248                 return -EIO;
 249         }
 250         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_ADAPTER,
 251                                        adapter, NULL, NULL, id, ref);
 252 }
 253
 254 /**
 255  * zfcp_erp_adapter_reopen - Reopen adapter.
 256  * @adapter: Adapter to reopen.
 257  * @clear: Status flags to clear.
 258  * @id: Id for debug trace event.
 259  * @ref: Reference for debug trace event.
 260  */
 261 void zfcp_erp_adapter_reopen(struct zfcp_adapter *adapter, int clear,
 262                              char *id, void *ref)
 263 {
 264         unsigned long flags;
 265
 266         read_lock_irqsave(&zfcp_data.config_lock, flags);
 267         write_lock(&adapter->erp_lock);
 268         _zfcp_erp_adapter_reopen(adapter, clear, id, ref);
 269         write_unlock(&adapter->erp_lock);
 270         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 271 }
 272
 273 /**
 274  * zfcp_erp_adapter_shutdown - Shutdown adapter.
 275  * @adapter: Adapter to shut down.
 276  * @clear: Status flags to clear.
 277  * @id: Id for debug trace event.
 278  * @ref: Reference for debug trace event.
 279  */
 280 void zfcp_erp_adapter_shutdown(struct zfcp_adapter *adapter, int clear,
 281                                char *id, void *ref)
 282 {
 283         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 284         zfcp_erp_adapter_reopen(adapter, clear | flags, id, ref);
 285 }
 286
 287 /**
 288  * zfcp_erp_port_shutdown - Shutdown port
 289  * @port: Port to shut down.
 290  * @clear: Status flags to clear.
 291  * @id: Id for debug trace event.
 292  * @ref: Reference for debug trace event.
 293  */
 294 void zfcp_erp_port_shutdown(struct zfcp_port *port, int clear, char *id,
 295                             void *ref)
 296 {
 297         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 298         zfcp_erp_port_reopen(port, clear | flags, id, ref);
 299 }
 300
 301 /**
 302  * zfcp_erp_unit_shutdown - Shutdown unit
 303  * @unit: Unit to shut down.
 304  * @clear: Status flags to clear.
 305  * @id: Id for debug trace event.
 306  * @ref: Reference for debug trace event.
 307  */
 308 void zfcp_erp_unit_shutdown(struct zfcp_unit *unit, int clear, char *id,
 309                             void *ref)
 310 {
 311         int flags = ZFCP_STATUS_COMMON_RUNNING | ZFCP_STATUS_COMMON_ERP_FAILED;
 312         zfcp_erp_unit_reopen(unit, clear | flags, id, ref);
 313 }
 314
 315 static void zfcp_erp_port_block(struct zfcp_port *port, int clear)
 316 {
 317         zfcp_erp_modify_port_status(port, "erpblk1", NULL,
 318                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear,
 319                                     ZFCP_CLEAR);
 320 }
 321
 322 static void _zfcp_erp_port_forced_reopen(struct zfcp_port *port,
 323                                          int clear, char *id, void *ref)
 324 {
 325         zfcp_erp_port_block(port, clear);
 326         zfcp_scsi_schedule_rport_block(port);
 327
 328         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 329                 return;
 330
 331         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT_FORCED,
 332                                 port->adapter, port, NULL, id, ref);
 333 }
 334
 335 /**
 336  * zfcp_erp_port_forced_reopen - Forced close of port and open again
 337  * @port: Port to force close and to reopen.
 338  * @id: Id for debug trace event.
 339  * @ref: Reference for debug trace event.
 340  */
 341 void zfcp_erp_port_forced_reopen(struct zfcp_port *port, int clear, char *id,
 342                                  void *ref)
 343 {
 344         unsigned long flags;
 345         struct zfcp_adapter *adapter = port->adapter;
 346
 347         read_lock_irqsave(&zfcp_data.config_lock, flags);
 348         write_lock(&adapter->erp_lock);
 349         _zfcp_erp_port_forced_reopen(port, clear, id, ref);
 350         write_unlock(&adapter->erp_lock);
 351         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 352 }
 353
 354 static int _zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id,
 355                                  void *ref)
 356 {
 357         zfcp_erp_port_block(port, clear);
 358         zfcp_scsi_schedule_rport_block(port);
 359
 360         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
 361                 /* ensure propagation of failed status to new devices */
 362                 zfcp_erp_port_failed(port, "erpreo1", NULL);
 363                 return -EIO;
 364         }
 365
 366         return zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_PORT,
 367                                        port->adapter, port, NULL, id, ref);
 368 }
 369
 370 /**
 371  * zfcp_erp_port_reopen - trigger remote port recovery
 372  * @port: port to recover
 373  * @clear_mask: flags in port status to be cleared
 374  *
 375  * Returns 0 if recovery has been triggered, < 0 if not.
 376  */
 377 int zfcp_erp_port_reopen(struct zfcp_port *port, int clear, char *id, void *ref)
 378 {
 379         unsigned long flags;
 380         int retval;
 381         struct zfcp_adapter *adapter = port->adapter;
 382
 383         read_lock_irqsave(&zfcp_data.config_lock, flags);
 384         write_lock(&adapter->erp_lock);
 385         retval = _zfcp_erp_port_reopen(port, clear, id, ref);
 386         write_unlock(&adapter->erp_lock);
 387         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 388
 389         return retval;
 390 }
 391
 392 static void zfcp_erp_unit_block(struct zfcp_unit *unit, int clear_mask)
 393 {
 394         zfcp_erp_modify_unit_status(unit, "erublk1", NULL,
 395                                     ZFCP_STATUS_COMMON_UNBLOCKED | clear_mask,
 396                                     ZFCP_CLEAR);
 397 }
 398
 399 static void _zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 400                                   void *ref)
 401 {
 402         struct zfcp_adapter *adapter = unit->port->adapter;
 403
 404         zfcp_erp_unit_block(unit, clear);
 405
 406         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED)
 407                 return;
 408
 409         zfcp_erp_action_enqueue(ZFCP_ERP_ACTION_REOPEN_UNIT,
 410                                 adapter, unit->port, unit, id, ref);
 411 }
 412
 413 /**
 414  * zfcp_erp_unit_reopen - initiate reopen of a unit
 415  * @unit: unit to be reopened
 416  * @clear_mask: specifies flags in unit status to be cleared
 417  * Return: 0 on success, < 0 on error
 418  */
 419 void zfcp_erp_unit_reopen(struct zfcp_unit *unit, int clear, char *id,
 420                           void *ref)
 421 {
 422         unsigned long flags;
 423         struct zfcp_port *port = unit->port;
 424         struct zfcp_adapter *adapter = port->adapter;
 425
 426         read_lock_irqsave(&zfcp_data.config_lock, flags);
 427         write_lock(&adapter->erp_lock);
 428         _zfcp_erp_unit_reopen(unit, clear, id, ref);
 429         write_unlock(&adapter->erp_lock);
 430         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 431 }
 432
 433 static int status_change_set(unsigned long mask, atomic_t *status)
 434 {
 435         return (atomic_read(status) ^ mask) & mask;
 436 }
 437
 438 static int status_change_clear(unsigned long mask, atomic_t *status)
 439 {
 440         return atomic_read(status) & mask;
 441 }
 442
 443 static void zfcp_erp_adapter_unblock(struct zfcp_adapter *adapter)
 444 {
 445         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status))
 446                 zfcp_rec_dbf_event_adapter("eraubl1", NULL, adapter);
 447         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &adapter->status);
 448 }
 449
 450 static void zfcp_erp_port_unblock(struct zfcp_port *port)
 451 {
 452         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status))
 453                 zfcp_rec_dbf_event_port("erpubl1", NULL, port);
 454         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &port->status);
 455 }
 456
 457 static void zfcp_erp_unit_unblock(struct zfcp_unit *unit)
 458 {
 459         if (status_change_set(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status))
 460                 zfcp_rec_dbf_event_unit("eruubl1", NULL, unit);
 461         atomic_set_mask(ZFCP_STATUS_COMMON_UNBLOCKED, &unit->status);
 462 }
 463
 464 static void zfcp_erp_action_to_running(struct zfcp_erp_action *erp_action)
 465 {
 466         list_move(&erp_action->list, &erp_action->adapter->erp_running_head);
 467         zfcp_rec_dbf_event_action("erator1", erp_action);
 468 }
 469
 470 static void zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *act)
 471 {
 472         struct zfcp_adapter *adapter = act->adapter;
 473
 474         if (!act->fsf_req)
 475                 return;
 476
 477         spin_lock(&adapter->req_list_lock);
 478         if (zfcp_reqlist_find_safe(adapter, act->fsf_req) &&
 479             act->fsf_req->erp_action == act) {
 480                 if (act->status & (ZFCP_STATUS_ERP_DISMISSED |
 481                                    ZFCP_STATUS_ERP_TIMEDOUT)) {
 482                         act->fsf_req->status |= ZFCP_STATUS_FSFREQ_DISMISSED;
 483                         zfcp_rec_dbf_event_action("erscf_1", act);
 484                         act->fsf_req->erp_action = NULL;
 485                 }
 486                 if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 487                         zfcp_rec_dbf_event_action("erscf_2", act);
 488                 if (act->fsf_req->status & ZFCP_STATUS_FSFREQ_DISMISSED)
 489                         act->fsf_req = NULL;
 490         } else
 491                 act->fsf_req = NULL;
 492         spin_unlock(&adapter->req_list_lock);
 493 }
 494
 495 /**
 496  * zfcp_erp_notify - Trigger ERP action.
 497  * @erp_action: ERP action to continue.
 498  * @set_mask: ERP action status flags to set.
 499  */
 500 void zfcp_erp_notify(struct zfcp_erp_action *erp_action, unsigned long set_mask)
 501 {
 502         struct zfcp_adapter *adapter = erp_action->adapter;
 503         unsigned long flags;
 504
 505         write_lock_irqsave(&adapter->erp_lock, flags);
 506         if (zfcp_erp_action_exists(erp_action) == ZFCP_ERP_ACTION_RUNNING) {
 507                 erp_action->status |= set_mask;
 508                 zfcp_erp_action_ready(erp_action);
 509         }
 510         write_unlock_irqrestore(&adapter->erp_lock, flags);
 511 }
 512
 513 /**
 514  * zfcp_erp_timeout_handler - Trigger ERP action from timed out ERP request
 515  * @data: ERP action (from timer data)
 516  */
 517 void zfcp_erp_timeout_handler(unsigned long data)
 518 {
 519         struct zfcp_erp_action *act = (struct zfcp_erp_action *) data;
 520         zfcp_erp_notify(act, ZFCP_STATUS_ERP_TIMEDOUT);
 521 }
 522
 523 static void zfcp_erp_memwait_handler(unsigned long data)
 524 {
 525         zfcp_erp_notify((struct zfcp_erp_action *)data, 0);
 526 }
 527
 528 static void zfcp_erp_strategy_memwait(struct zfcp_erp_action *erp_action)
 529 {
 530         init_timer(&erp_action->timer);
 531         erp_action->timer.function = zfcp_erp_memwait_handler;
 532         erp_action->timer.data = (unsigned long) erp_action;
 533         erp_action->timer.expires = jiffies + HZ;
 534         add_timer(&erp_action->timer);
 535 }
 536
 537 static void _zfcp_erp_port_reopen_all(struct zfcp_adapter *adapter,
 538                                       int clear, char *id, void *ref)
 539 {
 540         struct zfcp_port *port;
 541
 542         list_for_each_entry(port, &adapter->port_list_head, list)
 543                 _zfcp_erp_port_reopen(port, clear, id, ref);
 544 }
 545
 546 static void _zfcp_erp_unit_reopen_all(struct zfcp_port *port, int clear,
 547                                       char *id, void *ref)
 548 {
 549         struct zfcp_unit *unit;
 550
 551         list_for_each_entry(unit, &port->unit_list_head, list)
 552                 _zfcp_erp_unit_reopen(unit, clear, id, ref);
 553 }
 554
 555 static void zfcp_erp_strategy_followup_failed(struct zfcp_erp_action *act)
 556 {
 557         switch (act->action) {
 558         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 559                 _zfcp_erp_adapter_reopen(act->adapter, 0, "ersff_1", NULL);
 560                 break;
 561         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 562                 _zfcp_erp_port_forced_reopen(act->port, 0, "ersff_2", NULL);
 563                 break;
 564         case ZFCP_ERP_ACTION_REOPEN_PORT:
 565                 _zfcp_erp_port_reopen(act->port, 0, "ersff_3", NULL);
 566                 break;
 567         case ZFCP_ERP_ACTION_REOPEN_UNIT:
 568                 _zfcp_erp_unit_reopen(act->unit, 0, "ersff_4", NULL);
 569                 break;
 570         }
 571 }
 572
 573 static void zfcp_erp_strategy_followup_success(struct zfcp_erp_action *act)
 574 {
 575         switch (act->action) {
 576         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
 577                 _zfcp_erp_port_reopen_all(act->adapter, 0, "ersfs_1", NULL);
 578                 break;
 579         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
 580                 _zfcp_erp_port_reopen(act->port, 0, "ersfs_2", NULL);
 581                 break;
 582         case ZFCP_ERP_ACTION_REOPEN_PORT:
 583                 _zfcp_erp_unit_reopen_all(act->port, 0, "ersfs_3", NULL);
 584                 break;
 585         }
 586 }
 587
 588 static void zfcp_erp_wakeup(struct zfcp_adapter *adapter)
 589 {
 590         unsigned long flags;
 591
 592         read_lock_irqsave(&zfcp_data.config_lock, flags);
 593         read_lock(&adapter->erp_lock);
 594         if (list_empty(&adapter->erp_ready_head) &&
 595             list_empty(&adapter->erp_running_head)) {
 596                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_PENDING,
 597                                           &adapter->status);
 598                         wake_up(&adapter->erp_done_wqh);
 599         }
 600         read_unlock(&adapter->erp_lock);
 601         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
 602 }
 603
 604 static int zfcp_erp_adapter_strategy_open_qdio(struct zfcp_erp_action *act)
 605 {
 606         struct zfcp_qdio *qdio = act->adapter->qdio;
 607
 608         if (zfcp_qdio_open(qdio))
 609                 return ZFCP_ERP_FAILED;
 610         init_waitqueue_head(&qdio->req_q_wq);
 611         atomic_set_mask(ZFCP_STATUS_ADAPTER_QDIOUP, &act->adapter->status);
 612         return ZFCP_ERP_SUCCEEDED;
 613 }
 614
 615 static void zfcp_erp_enqueue_ptp_port(struct zfcp_adapter *adapter)
 616 {
 617         struct zfcp_port *port;
 618         port = zfcp_port_enqueue(adapter, adapter->peer_wwpn, 0,
 619                                  adapter->peer_d_id);
 620         if (IS_ERR(port)) /* error or port already attached */
 621                 return;
 622         _zfcp_erp_port_reopen(port, 0, "ereptp1", NULL);
 623 }
 624
 625 static int zfcp_erp_adapter_strat_fsf_xconf(struct zfcp_erp_action *erp_action)
 626 {
 627         int retries;
 628         int sleep = 1;
 629         struct zfcp_adapter *adapter = erp_action->adapter;
 630
 631         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK, &adapter->status);
 632
 633         for (retries = 7; retries; retries--) {
 634                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 635                                   &adapter->status);
 636                 write_lock_irq(&adapter->erp_lock);
 637                 zfcp_erp_action_to_running(erp_action);
 638                 write_unlock_irq(&adapter->erp_lock);
 639                 if (zfcp_fsf_exchange_config_data(erp_action)) {
 640                         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 641                                           &adapter->status);
 642                         return ZFCP_ERP_FAILED;
 643                 }
 644
 645                 zfcp_rec_dbf_event_thread_lock("erasfx1", adapter);
 646                 down(&adapter->erp_ready_sem);
 647                 zfcp_rec_dbf_event_thread_lock("erasfx2", adapter);
 648                 if (erp_action->status & ZFCP_STATUS_ERP_TIMEDOUT)
 649                         break;
 650
 651                 if (!(atomic_read(&adapter->status) &
 652                       ZFCP_STATUS_ADAPTER_HOST_CON_INIT))
 653                         break;
 654
 655                 ssleep(sleep);
 656                 sleep *= 2;
 657         }
 658
 659         atomic_clear_mask(ZFCP_STATUS_ADAPTER_HOST_CON_INIT,
 660                           &adapter->status);
 661
 662         if (!(atomic_read(&adapter->status) & ZFCP_STATUS_ADAPTER_XCONFIG_OK))
 663                 return ZFCP_ERP_FAILED;
 664
 665         if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 666                 zfcp_erp_enqueue_ptp_port(adapter);
 667
 668         return ZFCP_ERP_SUCCEEDED;
 669 }
 670
 671 static int zfcp_erp_adapter_strategy_open_fsf_xport(struct zfcp_erp_action *act)
 672 {
 673         int ret;
 674         struct zfcp_adapter *adapter = act->adapter;
 675
 676         write_lock_irq(&adapter->erp_lock);
 677         zfcp_erp_action_to_running(act);
 678         write_unlock_irq(&adapter->erp_lock);
 679
 680         ret = zfcp_fsf_exchange_port_data(act);
 681         if (ret == -EOPNOTSUPP)
 682                 return ZFCP_ERP_SUCCEEDED;
 683         if (ret)
 684                 return ZFCP_ERP_FAILED;
 685
 686         zfcp_rec_dbf_event_thread_lock("erasox1", adapter);
 687         down(&adapter->erp_ready_sem);
 688         zfcp_rec_dbf_event_thread_lock("erasox2", adapter);
 689         if (act->status & ZFCP_STATUS_ERP_TIMEDOUT)
 690                 return ZFCP_ERP_FAILED;
 691
 692         return ZFCP_ERP_SUCCEEDED;
 693 }
 694
 695 static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
 696 {
 697         if (zfcp_erp_adapter_strat_fsf_xconf(act) == ZFCP_ERP_FAILED)
 698                 return ZFCP_ERP_FAILED;
 699
 700         if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
 701                 return ZFCP_ERP_FAILED;
 702
 703         atomic_set(&act->adapter->stat_miss, 16);
 704         if (zfcp_status_read_refill(act->adapter))
 705                 return ZFCP_ERP_FAILED;
 706
 707         return ZFCP_ERP_SUCCEEDED;
 708 }
 709
 710 static void zfcp_erp_adapter_strategy_close(struct zfcp_erp_action *act)
 711 {
 712         struct zfcp_adapter *adapter = act->adapter;
 713
 714         /* close queues to ensure that buffers are not accessed by adapter */
 715         zfcp_qdio_close(adapter->qdio);
 716         zfcp_fsf_req_dismiss_all(adapter);
 717         adapter->fsf_req_seq_no = 0;
 718         zfcp_fc_wka_ports_force_offline(adapter->gs);
 719         /* all ports and units are closed */
 720         zfcp_erp_modify_adapter_status(adapter, "erascl1", NULL,
 721                                        ZFCP_STATUS_COMMON_OPEN, ZFCP_CLEAR);
 722
 723         atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 724                           ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED, &adapter->status);
 725 }
 726
 727 static int zfcp_erp_adapter_strategy_open(struct zfcp_erp_action *act)
 728 {
 729         struct zfcp_adapter *adapter = act->adapter;
 730
 731         if (zfcp_erp_adapter_strategy_open_qdio(act)) {
 732                 atomic_clear_mask(ZFCP_STATUS_ADAPTER_XCONFIG_OK |
 733                                   ZFCP_STATUS_ADAPTER_LINK_UNPLUGGED,
 734                                   &adapter->status);
 735                 return ZFCP_ERP_FAILED;
 736         }
 737
 738         if (zfcp_erp_adapter_strategy_open_fsf(act)) {
 739                 zfcp_erp_adapter_strategy_close(act);
 740                 return ZFCP_ERP_FAILED;
 741         }
 742
 743         atomic_set_mask(ZFCP_STATUS_COMMON_OPEN, &adapter->status);
 744
 745         return ZFCP_ERP_SUCCEEDED;
 746 }
 747
 748 static int zfcp_erp_adapter_strategy(struct zfcp_erp_action *act)
 749 {
 750         struct zfcp_adapter *adapter = act->adapter;
 751
 752         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_OPEN) {
 753                 zfcp_erp_adapter_strategy_close(act);
 754                 if (act->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 755                         return ZFCP_ERP_EXIT;
 756         }
 757
 758         if (zfcp_erp_adapter_strategy_open(act)) {
 759                 ssleep(8);
 760                 return ZFCP_ERP_FAILED;
 761         }
 762
 763         return ZFCP_ERP_SUCCEEDED;
 764 }
 765
 766 static int zfcp_erp_port_forced_strategy_close(struct zfcp_erp_action *act)
 767 {
 768         int retval;
 769
 770         retval = zfcp_fsf_close_physical_port(act);
 771         if (retval == -ENOMEM)
 772                 return ZFCP_ERP_NOMEM;
 773         act->step = ZFCP_ERP_STEP_PHYS_PORT_CLOSING;
 774         if (retval)
 775                 return ZFCP_ERP_FAILED;
 776
 777         return ZFCP_ERP_CONTINUES;
 778 }
 779
 780 static void zfcp_erp_port_strategy_clearstati(struct zfcp_port *port)
 781 {
 782         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED, &port->status);
 783 }
 784
 785 static int zfcp_erp_port_forced_strategy(struct zfcp_erp_action *erp_action)
 786 {
 787         struct zfcp_port *port = erp_action->port;
 788         int status = atomic_read(&port->status);
 789
 790         switch (erp_action->step) {
 791         case ZFCP_ERP_STEP_UNINITIALIZED:
 792                 zfcp_erp_port_strategy_clearstati(port);
 793                 if ((status & ZFCP_STATUS_PORT_PHYS_OPEN) &&
 794                     (status & ZFCP_STATUS_COMMON_OPEN))
 795                         return zfcp_erp_port_forced_strategy_close(erp_action);
 796                 else
 797                         return ZFCP_ERP_FAILED;
 798
 799         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 800                 if (!(status & ZFCP_STATUS_PORT_PHYS_OPEN))
 801                         return ZFCP_ERP_SUCCEEDED;
 802         }
 803         return ZFCP_ERP_FAILED;
 804 }
 805
 806 static int zfcp_erp_port_strategy_close(struct zfcp_erp_action *erp_action)
 807 {
 808         int retval;
 809
 810         retval = zfcp_fsf_close_port(erp_action);
 811         if (retval == -ENOMEM)
 812                 return ZFCP_ERP_NOMEM;
 813         erp_action->step = ZFCP_ERP_STEP_PORT_CLOSING;
 814         if (retval)
 815                 return ZFCP_ERP_FAILED;
 816         return ZFCP_ERP_CONTINUES;
 817 }
 818
 819 static int zfcp_erp_port_strategy_open_port(struct zfcp_erp_action *erp_action)
 820 {
 821         int retval;
 822
 823         retval = zfcp_fsf_open_port(erp_action);
 824         if (retval == -ENOMEM)
 825                 return ZFCP_ERP_NOMEM;
 826         erp_action->step = ZFCP_ERP_STEP_PORT_OPENING;
 827         if (retval)
 828                 return ZFCP_ERP_FAILED;
 829         return ZFCP_ERP_CONTINUES;
 830 }
 831
 832 static int zfcp_erp_open_ptp_port(struct zfcp_erp_action *act)
 833 {
 834         struct zfcp_adapter *adapter = act->adapter;
 835         struct zfcp_port *port = act->port;
 836
 837         if (port->wwpn != adapter->peer_wwpn) {
 838                 zfcp_erp_port_failed(port, "eroptp1", NULL);
 839                 return ZFCP_ERP_FAILED;
 840         }
 841         port->d_id = adapter->peer_d_id;
 842         return zfcp_erp_port_strategy_open_port(act);
 843 }
 844
 845 void zfcp_erp_port_strategy_open_lookup(struct work_struct *work)
 846 {
 847         int retval;
 848         struct zfcp_port *port = container_of(work, struct zfcp_port,
 849                                               gid_pn_work);
 850
 851         retval = zfcp_fc_ns_gid_pn(&port->erp_action);
 852         if (!retval) {
 853                 port->erp_action.step = ZFCP_ERP_STEP_NAMESERVER_LOOKUP;
 854                 goto out;
 855         }
 856         if (retval == -ENOMEM) {
 857                 zfcp_erp_notify(&port->erp_action, ZFCP_STATUS_ERP_LOWMEM);
 858                 goto out;
 859         }
 860         /* all other error condtions */
 861         zfcp_erp_notify(&port->erp_action, 0);
 862 out:
 863         zfcp_port_put(port);
 864 }
 865
 866 static int zfcp_erp_port_strategy_open_common(struct zfcp_erp_action *act)
 867 {
 868         struct zfcp_adapter *adapter = act->adapter;
 869         struct zfcp_port *port = act->port;
 870         int p_status = atomic_read(&port->status);
 871
 872         switch (act->step) {
 873         case ZFCP_ERP_STEP_UNINITIALIZED:
 874         case ZFCP_ERP_STEP_PHYS_PORT_CLOSING:
 875         case ZFCP_ERP_STEP_PORT_CLOSING:
 876                 if (fc_host_port_type(adapter->scsi_host) == FC_PORTTYPE_PTP)
 877                         return zfcp_erp_open_ptp_port(act);
 878                 if (!port->d_id) {
 879                         zfcp_port_get(port);
 880                         if (!queue_work(adapter->work_queue,
 881                                         &port->gid_pn_work))
 882                                 zfcp_port_put(port);
 883                         return ZFCP_ERP_CONTINUES;
 884                 }
 885                 /* fall through */
 886         case ZFCP_ERP_STEP_NAMESERVER_LOOKUP:
 887                 if (!port->d_id)
 888                         return ZFCP_ERP_FAILED;
 889                 return zfcp_erp_port_strategy_open_port(act);
 890
 891         case ZFCP_ERP_STEP_PORT_OPENING:
 892                 /* D_ID might have changed during open */
 893                 if (p_status & ZFCP_STATUS_COMMON_OPEN) {
 894                         if (port->d_id)
 895                                 return ZFCP_ERP_SUCCEEDED;
 896                         else {
 897                                 act->step = ZFCP_ERP_STEP_PORT_CLOSING;
 898                                 return ZFCP_ERP_CONTINUES;
 899                         }
 900                 }
 901                 if (port->d_id && !(p_status & ZFCP_STATUS_COMMON_NOESC)) {
 902                         port->d_id = 0;
 903                         _zfcp_erp_port_reopen(port, 0, "erpsoc1", NULL);
 904                         return ZFCP_ERP_EXIT;
 905                 }
 906                 /* fall through otherwise */
 907         }
 908         return ZFCP_ERP_FAILED;
 909 }
 910
 911 static int zfcp_erp_port_strategy(struct zfcp_erp_action *erp_action)
 912 {
 913         struct zfcp_port *port = erp_action->port;
 914
 915         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC)
 916                 goto close_init_done;
 917
 918         switch (erp_action->step) {
 919         case ZFCP_ERP_STEP_UNINITIALIZED:
 920                 zfcp_erp_port_strategy_clearstati(port);
 921                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 922                         return zfcp_erp_port_strategy_close(erp_action);
 923                 break;
 924
 925         case ZFCP_ERP_STEP_PORT_CLOSING:
 926                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_OPEN)
 927                         return ZFCP_ERP_FAILED;
 928                 break;
 929         }
 930
 931 close_init_done:
 932         if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 933                 return ZFCP_ERP_EXIT;
 934
 935         return zfcp_erp_port_strategy_open_common(erp_action);
 936 }
 937
 938 static void zfcp_erp_unit_strategy_clearstati(struct zfcp_unit *unit)
 939 {
 940         atomic_clear_mask(ZFCP_STATUS_COMMON_ACCESS_DENIED |
 941                           ZFCP_STATUS_UNIT_SHARED |
 942                           ZFCP_STATUS_UNIT_READONLY,
 943                           &unit->status);
 944 }
 945
 946 static int zfcp_erp_unit_strategy_close(struct zfcp_erp_action *erp_action)
 947 {
 948         int retval = zfcp_fsf_close_unit(erp_action);
 949         if (retval == -ENOMEM)
 950                 return ZFCP_ERP_NOMEM;
 951         erp_action->step = ZFCP_ERP_STEP_UNIT_CLOSING;
 952         if (retval)
 953                 return ZFCP_ERP_FAILED;
 954         return ZFCP_ERP_CONTINUES;
 955 }
 956
 957 static int zfcp_erp_unit_strategy_open(struct zfcp_erp_action *erp_action)
 958 {
 959         int retval = zfcp_fsf_open_unit(erp_action);
 960         if (retval == -ENOMEM)
 961                 return ZFCP_ERP_NOMEM;
 962         erp_action->step = ZFCP_ERP_STEP_UNIT_OPENING;
 963         if (retval)
 964                 return  ZFCP_ERP_FAILED;
 965         return ZFCP_ERP_CONTINUES;
 966 }
 967
 968 static int zfcp_erp_unit_strategy(struct zfcp_erp_action *erp_action)
 969 {
 970         struct zfcp_unit *unit = erp_action->unit;
 971
 972         switch (erp_action->step) {
 973         case ZFCP_ERP_STEP_UNINITIALIZED:
 974                 zfcp_erp_unit_strategy_clearstati(unit);
 975                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 976                         return zfcp_erp_unit_strategy_close(erp_action);
 977                 /* already closed, fall through */
 978         case ZFCP_ERP_STEP_UNIT_CLOSING:
 979                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 980                         return ZFCP_ERP_FAILED;
 981                 if (erp_action->status & ZFCP_STATUS_ERP_CLOSE_ONLY)
 982                         return ZFCP_ERP_EXIT;
 983                 return zfcp_erp_unit_strategy_open(erp_action);
 984
 985         case ZFCP_ERP_STEP_UNIT_OPENING:
 986                 if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_OPEN)
 987                         return ZFCP_ERP_SUCCEEDED;
 988         }
 989         return ZFCP_ERP_FAILED;
 990 }
 991
 992 static int zfcp_erp_strategy_check_unit(struct zfcp_unit *unit, int result)
 993 {
 994         switch (result) {
 995         case ZFCP_ERP_SUCCEEDED :
 996                 atomic_set(&unit->erp_counter, 0);
 997                 zfcp_erp_unit_unblock(unit);
 998                 break;
 999         case ZFCP_ERP_FAILED :
1000                 atomic_inc(&unit->erp_counter);
1001                 if (atomic_read(&unit->erp_counter) > ZFCP_MAX_ERPS) {
1002                         dev_err(&unit->port->adapter->ccw_device->dev,
1003                                 "ERP failed for unit 0x%016Lx on "
1004                                 "port 0x%016Lx\n",
1005                                 (unsigned long long)unit->fcp_lun,
1006                                 (unsigned long long)unit->port->wwpn);
1007                         zfcp_erp_unit_failed(unit, "erusck1", NULL);
1008                 }
1009                 break;
1010         }
1011
1012         if (atomic_read(&unit->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1013                 zfcp_erp_unit_block(unit, 0);
1014                 result = ZFCP_ERP_EXIT;
1015         }
1016         return result;
1017 }
1018
1019 static int zfcp_erp_strategy_check_port(struct zfcp_port *port, int result)
1020 {
1021         switch (result) {
1022         case ZFCP_ERP_SUCCEEDED :
1023                 atomic_set(&port->erp_counter, 0);
1024                 zfcp_erp_port_unblock(port);
1025                 break;
1026
1027         case ZFCP_ERP_FAILED :
1028                 if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_NOESC) {
1029                         zfcp_erp_port_block(port, 0);
1030                         result = ZFCP_ERP_EXIT;
1031                 }
1032                 atomic_inc(&port->erp_counter);
1033                 if (atomic_read(&port->erp_counter) > ZFCP_MAX_ERPS) {
1034                         dev_err(&port->adapter->ccw_device->dev,
1035                                 "ERP failed for remote port 0x%016Lx\n",
1036                                 (unsigned long long)port->wwpn);
1037                         zfcp_erp_port_failed(port, "erpsck1", NULL);
1038                 }
1039                 break;
1040         }
1041
1042         if (atomic_read(&port->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1043                 zfcp_erp_port_block(port, 0);
1044                 result = ZFCP_ERP_EXIT;
1045         }
1046         return result;
1047 }
1048
1049 static int zfcp_erp_strategy_check_adapter(struct zfcp_adapter *adapter,
1050                                            int result)
1051 {
1052         switch (result) {
1053         case ZFCP_ERP_SUCCEEDED :
1054                 atomic_set(&adapter->erp_counter, 0);
1055                 zfcp_erp_adapter_unblock(adapter);
1056                 break;
1057
1058         case ZFCP_ERP_FAILED :
1059                 atomic_inc(&adapter->erp_counter);
1060                 if (atomic_read(&adapter->erp_counter) > ZFCP_MAX_ERPS) {
1061                         dev_err(&adapter->ccw_device->dev,
1062                                 "ERP cannot recover an error "
1063                                 "on the FCP device\n");
1064                         zfcp_erp_adapter_failed(adapter, "erasck1", NULL);
1065                 }
1066                 break;
1067         }
1068
1069         if (atomic_read(&adapter->status) & ZFCP_STATUS_COMMON_ERP_FAILED) {
1070                 zfcp_erp_adapter_block(adapter, 0);
1071                 result = ZFCP_ERP_EXIT;
1072         }
1073         return result;
1074 }
1075
1076 static int zfcp_erp_strategy_check_target(struct zfcp_erp_action *erp_action,
1077                                           int result)
1078 {
1079         struct zfcp_adapter *adapter = erp_action->adapter;
1080         struct zfcp_port *port = erp_action->port;
1081         struct zfcp_unit *unit = erp_action->unit;
1082
1083         switch (erp_action->action) {
1084
1085         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1086                 result = zfcp_erp_strategy_check_unit(unit, result);
1087                 break;
1088
1089         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1090         case ZFCP_ERP_ACTION_REOPEN_PORT:
1091                 result = zfcp_erp_strategy_check_port(port, result);
1092                 break;
1093
1094         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1095                 result = zfcp_erp_strategy_check_adapter(adapter, result);
1096                 break;
1097         }
1098         return result;
1099 }
1100
1101 static int zfcp_erp_strat_change_det(atomic_t *target_status, u32 erp_status)
1102 {
1103         int status = atomic_read(target_status);
1104
1105         if ((status & ZFCP_STATUS_COMMON_RUNNING) &&
1106             (erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1107                 return 1; /* take it online */
1108
1109         if (!(status & ZFCP_STATUS_COMMON_RUNNING) &&
1110             !(erp_status & ZFCP_STATUS_ERP_CLOSE_ONLY))
1111                 return 1; /* take it offline */
1112
1113         return 0;
1114 }
1115
1116 static int zfcp_erp_strategy_statechange(struct zfcp_erp_action *act, int ret)
1117 {
1118         int action = act->action;
1119         struct zfcp_adapter *adapter = act->adapter;
1120         struct zfcp_port *port = act->port;
1121         struct zfcp_unit *unit = act->unit;
1122         u32 erp_status = act->status;
1123
1124         switch (action) {
1125         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1126                 if (zfcp_erp_strat_change_det(&adapter->status, erp_status)) {
1127                         _zfcp_erp_adapter_reopen(adapter,
1128                                                  ZFCP_STATUS_COMMON_ERP_FAILED,
1129                                                  "ersscg1", NULL);
1130                         return ZFCP_ERP_EXIT;
1131                 }
1132                 break;
1133
1134         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1135         case ZFCP_ERP_ACTION_REOPEN_PORT:
1136                 if (zfcp_erp_strat_change_det(&port->status, erp_status)) {
1137                         _zfcp_erp_port_reopen(port,
1138                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1139                                               "ersscg2", NULL);
1140                         return ZFCP_ERP_EXIT;
1141                 }
1142                 break;
1143
1144         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1145                 if (zfcp_erp_strat_change_det(&unit->status, erp_status)) {
1146                         _zfcp_erp_unit_reopen(unit,
1147                                               ZFCP_STATUS_COMMON_ERP_FAILED,
1148                                               "ersscg3", NULL);
1149                         return ZFCP_ERP_EXIT;
1150                 }
1151                 break;
1152         }
1153         return ret;
1154 }
1155
1156 static void zfcp_erp_action_dequeue(struct zfcp_erp_action *erp_action)
1157 {
1158         struct zfcp_adapter *adapter = erp_action->adapter;
1159
1160         adapter->erp_total_count--;
1161         if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1162                 adapter->erp_low_mem_count--;
1163                 erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1164         }
1165
1166         list_del(&erp_action->list);
1167         zfcp_rec_dbf_event_action("eractd1", erp_action);
1168
1169         switch (erp_action->action) {
1170         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1171                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1172                                   &erp_action->unit->status);
1173                 break;
1174
1175         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1176         case ZFCP_ERP_ACTION_REOPEN_PORT:
1177                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1178                                   &erp_action->port->status);
1179                 break;
1180
1181         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1182                 atomic_clear_mask(ZFCP_STATUS_COMMON_ERP_INUSE,
1183                                   &erp_action->adapter->status);
1184                 break;
1185         }
1186 }
1187
1188 static void zfcp_erp_action_cleanup(struct zfcp_erp_action *act, int result)
1189 {
1190         struct zfcp_adapter *adapter = act->adapter;
1191         struct zfcp_port *port = act->port;
1192         struct zfcp_unit *unit = act->unit;
1193
1194         switch (act->action) {
1195         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1196                 if ((result == ZFCP_ERP_SUCCEEDED) && !unit->device) {
1197                         zfcp_unit_get(unit);
1198                         if (scsi_queue_work(unit->port->adapter->scsi_host,
1199                                             &unit->scsi_work) <= 0)
1200                                 zfcp_unit_put(unit);
1201                 }
1202                 zfcp_unit_put(unit);
1203                 break;
1204
1205         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1206         case ZFCP_ERP_ACTION_REOPEN_PORT:
1207                 if (result == ZFCP_ERP_SUCCEEDED)
1208                         zfcp_scsi_schedule_rport_register(port);
1209                 zfcp_port_put(port);
1210                 break;
1211
1212         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1213                 if (result == ZFCP_ERP_SUCCEEDED) {
1214                         register_service_level(&adapter->service_level);
1215                         schedule_work(&adapter->scan_work);
1216                 } else
1217                         unregister_service_level(&adapter->service_level);
1218                 zfcp_adapter_put(adapter);
1219                 break;
1220         }
1221 }
1222
1223 static int zfcp_erp_strategy_do_action(struct zfcp_erp_action *erp_action)
1224 {
1225         switch (erp_action->action) {
1226         case ZFCP_ERP_ACTION_REOPEN_ADAPTER:
1227                 return zfcp_erp_adapter_strategy(erp_action);
1228         case ZFCP_ERP_ACTION_REOPEN_PORT_FORCED:
1229                 return zfcp_erp_port_forced_strategy(erp_action);
1230         case ZFCP_ERP_ACTION_REOPEN_PORT:
1231                 return zfcp_erp_port_strategy(erp_action);
1232         case ZFCP_ERP_ACTION_REOPEN_UNIT:
1233                 return zfcp_erp_unit_strategy(erp_action);
1234         }
1235         return ZFCP_ERP_FAILED;
1236 }
1237
1238 static int zfcp_erp_strategy(struct zfcp_erp_action *erp_action)
1239 {
1240         int retval;
1241         struct zfcp_adapter *adapter = erp_action->adapter;
1242         unsigned long flags;
1243
1244         read_lock_irqsave(&zfcp_data.config_lock, flags);
1245         write_lock(&adapter->erp_lock);
1246
1247         zfcp_erp_strategy_check_fsfreq(erp_action);
1248
1249         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED) {
1250                 zfcp_erp_action_dequeue(erp_action);
1251                 retval = ZFCP_ERP_DISMISSED;
1252                 goto unlock;
1253         }
1254
1255         zfcp_erp_action_to_running(erp_action);
1256
1257         /* no lock to allow for blocking operations */
1258         write_unlock(&adapter->erp_lock);
1259         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1260         retval = zfcp_erp_strategy_do_action(erp_action);
1261         read_lock_irqsave(&zfcp_data.config_lock, flags);
1262         write_lock(&adapter->erp_lock);
1263
1264         if (erp_action->status & ZFCP_STATUS_ERP_DISMISSED)
1265                 retval = ZFCP_ERP_CONTINUES;
1266
1267         switch (retval) {
1268         case ZFCP_ERP_NOMEM:
1269                 if (!(erp_action->status & ZFCP_STATUS_ERP_LOWMEM)) {
1270                         ++adapter->erp_low_mem_count;
1271                         erp_action->status |= ZFCP_STATUS_ERP_LOWMEM;
1272                 }
1273                 if (adapter->erp_total_count == adapter->erp_low_mem_count)
1274                         _zfcp_erp_adapter_reopen(adapter, 0, "erstgy1", NULL);
1275                 else {
1276                         zfcp_erp_strategy_memwait(erp_action);
1277                         retval = ZFCP_ERP_CONTINUES;
1278                 }
1279                 goto unlock;
1280
1281         case ZFCP_ERP_CONTINUES:
1282                 if (erp_action->status & ZFCP_STATUS_ERP_LOWMEM) {
1283                         --adapter->erp_low_mem_count;
1284                         erp_action->status &= ~ZFCP_STATUS_ERP_LOWMEM;
1285                 }
1286                 goto unlock;
1287         }
1288
1289         retval = zfcp_erp_strategy_check_target(erp_action, retval);
1290         zfcp_erp_action_dequeue(erp_action);
1291         retval = zfcp_erp_strategy_statechange(erp_action, retval);
1292         if (retval == ZFCP_ERP_EXIT)
1293                 goto unlock;
1294         if (retval == ZFCP_ERP_SUCCEEDED)
1295                 zfcp_erp_strategy_followup_success(erp_action);
1296         if (retval == ZFCP_ERP_FAILED)
1297                 zfcp_erp_strategy_followup_failed(erp_action);
1298
1299  unlock:
1300         write_unlock(&adapter->erp_lock);
1301         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1302
1303         if (retval != ZFCP_ERP_CONTINUES)
1304                 zfcp_erp_action_cleanup(erp_action, retval);
1305
1306         return retval;
1307 }
1308
1309 static int zfcp_erp_thread(void *data)
1310 {
1311         struct zfcp_adapter *adapter = (struct zfcp_adapter *) data;
1312         struct list_head *next;
1313         struct zfcp_erp_action *act;
1314         unsigned long flags;
1315         int ignore;
1316
1317         daemonize("zfcperp%s", dev_name(&adapter->ccw_device->dev));
1318         /* Block all signals */
1319         siginitsetinv(&current->blocked, 0);
1320         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1321         wake_up(&adapter->erp_thread_wqh);
1322
1323         while (!(atomic_read(&adapter->status) &
1324                  ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL)) {
1325
1326                 zfcp_rec_dbf_event_thread_lock("erthrd1", adapter);
1327                 ignore = down_interruptible(&adapter->erp_ready_sem);
1328                 zfcp_rec_dbf_event_thread_lock("erthrd2", adapter);
1329
1330                 write_lock_irqsave(&adapter->erp_lock, flags);
1331                 next = adapter->erp_ready_head.next;
1332                 write_unlock_irqrestore(&adapter->erp_lock, flags);
1333
1334                 if (next != &adapter->erp_ready_head) {
1335                         act = list_entry(next, struct zfcp_erp_action, list);
1336
1337                         /* there is more to come after dismission, no notify */
1338                         if (zfcp_erp_strategy(act) != ZFCP_ERP_DISMISSED)
1339                                 zfcp_erp_wakeup(adapter);
1340                 }
1341         }
1342
1343         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1344         wake_up(&adapter->erp_thread_wqh);
1345
1346         return 0;
1347 }
1348
1349 /**
1350  * zfcp_erp_thread_setup - Start ERP thread for adapter
1351  * @adapter: Adapter to start the ERP thread for
1352  *
1353  * Returns 0 on success or error code from kernel_thread()
1354  */
1355 int zfcp_erp_thread_setup(struct zfcp_adapter *adapter)
1356 {
1357         int retval;
1358
1359         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_UP, &adapter->status);
1360         retval = kernel_thread(zfcp_erp_thread, adapter, SIGCHLD);
1361         if (retval < 0) {
1362                 dev_err(&adapter->ccw_device->dev,
1363                         "Creating an ERP thread for the FCP device failed.\n");
1364                 return retval;
1365         }
1366         wait_event(adapter->erp_thread_wqh,
1367                    atomic_read(&adapter->status) &
1368                         ZFCP_STATUS_ADAPTER_ERP_THREAD_UP);
1369         return 0;
1370 }
1371
1372 /**
1373  * zfcp_erp_thread_kill - Stop ERP thread.
1374  * @adapter: Adapter where the ERP thread should be stopped.
1375  *
1376  * The caller of this routine ensures that the specified adapter has
1377  * been shut down and that this operation has been completed. Thus,
1378  * there are no pending erp_actions which would need to be handled
1379  * here.
1380  */
1381 void zfcp_erp_thread_kill(struct zfcp_adapter *adapter)
1382 {
1383         atomic_set_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL, &adapter->status);
1384         up(&adapter->erp_ready_sem);
1385         zfcp_rec_dbf_event_thread_lock("erthrk1", adapter);
1386
1387         wait_event(adapter->erp_thread_wqh,
1388                    !(atomic_read(&adapter->status) &
1389                                 ZFCP_STATUS_ADAPTER_ERP_THREAD_UP));
1390
1391         atomic_clear_mask(ZFCP_STATUS_ADAPTER_ERP_THREAD_KILL,
1392                           &adapter->status);
1393 }
1394
1395 /**
1396  * zfcp_erp_adapter_failed - Set adapter status to failed.
1397  * @adapter: Failed adapter.
1398  * @id: Event id for debug trace.
1399  * @ref: Reference for debug trace.
1400  */
1401 void zfcp_erp_adapter_failed(struct zfcp_adapter *adapter, char *id, void *ref)
1402 {
1403         zfcp_erp_modify_adapter_status(adapter, id, ref,
1404                                        ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1405 }
1406
1407 /**
1408  * zfcp_erp_port_failed - Set port status to failed.
1409  * @port: Failed port.
1410  * @id: Event id for debug trace.
1411  * @ref: Reference for debug trace.
1412  */
1413 void zfcp_erp_port_failed(struct zfcp_port *port, char *id, void *ref)
1414 {
1415         zfcp_erp_modify_port_status(port, id, ref,
1416                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1417 }
1418
1419 /**
1420  * zfcp_erp_unit_failed - Set unit status to failed.
1421  * @unit: Failed unit.
1422  * @id: Event id for debug trace.
1423  * @ref: Reference for debug trace.
1424  */
1425 void zfcp_erp_unit_failed(struct zfcp_unit *unit, char *id, void *ref)
1426 {
1427         zfcp_erp_modify_unit_status(unit, id, ref,
1428                                     ZFCP_STATUS_COMMON_ERP_FAILED, ZFCP_SET);
1429 }
1430
1431 /**
1432  * zfcp_erp_wait - wait for completion of error recovery on an adapter
1433  * @adapter: adapter for which to wait for completion of its error recovery
1434  */
1435 void zfcp_erp_wait(struct zfcp_adapter *adapter)
1436 {
1437         wait_event(adapter->erp_done_wqh,
1438                    !(atomic_read(&adapter->status) &
1439                         ZFCP_STATUS_ADAPTER_ERP_PENDING));
1440 }
1441
1442 /**
1443  * zfcp_erp_modify_adapter_status - change adapter status bits
1444  * @adapter: adapter to change the status
1445  * @id: id for the debug trace
1446  * @ref: reference for the debug trace
1447  * @mask: status bits to change
1448  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1449  *
1450  * Changes in common status bits are propagated to attached ports and units.
1451  */
1452 void zfcp_erp_modify_adapter_status(struct zfcp_adapter *adapter, char *id,
1453                                     void *ref, u32 mask, int set_or_clear)
1454 {
1455         struct zfcp_port *port;
1456         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1457
1458         if (set_or_clear == ZFCP_SET) {
1459                 if (status_change_set(mask, &adapter->status))
1460                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1461                 atomic_set_mask(mask, &adapter->status);
1462         } else {
1463                 if (status_change_clear(mask, &adapter->status))
1464                         zfcp_rec_dbf_event_adapter(id, ref, adapter);
1465                 atomic_clear_mask(mask, &adapter->status);
1466                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1467                         atomic_set(&adapter->erp_counter, 0);
1468         }
1469
1470         if (common_mask)
1471                 list_for_each_entry(port, &adapter->port_list_head, list)
1472                         zfcp_erp_modify_port_status(port, id, ref, common_mask,
1473                                                     set_or_clear);
1474 }
1475
1476 /**
1477  * zfcp_erp_modify_port_status - change port status bits
1478  * @port: port to change the status bits
1479  * @id: id for the debug trace
1480  * @ref: reference for the debug trace
1481  * @mask: status bits to change
1482  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1483  *
1484  * Changes in common status bits are propagated to attached units.
1485  */
1486 void zfcp_erp_modify_port_status(struct zfcp_port *port, char *id, void *ref,
1487                                  u32 mask, int set_or_clear)
1488 {
1489         struct zfcp_unit *unit;
1490         u32 common_mask = mask & ZFCP_COMMON_FLAGS;
1491
1492         if (set_or_clear == ZFCP_SET) {
1493                 if (status_change_set(mask, &port->status))
1494                         zfcp_rec_dbf_event_port(id, ref, port);
1495                 atomic_set_mask(mask, &port->status);
1496         } else {
1497                 if (status_change_clear(mask, &port->status))
1498                         zfcp_rec_dbf_event_port(id, ref, port);
1499                 atomic_clear_mask(mask, &port->status);
1500                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED)
1501                         atomic_set(&port->erp_counter, 0);
1502         }
1503
1504         if (common_mask)
1505                 list_for_each_entry(unit, &port->unit_list_head, list)
1506                         zfcp_erp_modify_unit_status(unit, id, ref, common_mask,
1507                                                     set_or_clear);
1508 }
1509
1510 /**
1511  * zfcp_erp_modify_unit_status - change unit status bits
1512  * @unit: unit to change the status bits
1513  * @id: id for the debug trace
1514  * @ref: reference for the debug trace
1515  * @mask: status bits to change
1516  * @set_or_clear: ZFCP_SET or ZFCP_CLEAR
1517  */
1518 void zfcp_erp_modify_unit_status(struct zfcp_unit *unit, char *id, void *ref,
1519                                  u32 mask, int set_or_clear)
1520 {
1521         if (set_or_clear == ZFCP_SET) {
1522                 if (status_change_set(mask, &unit->status))
1523                         zfcp_rec_dbf_event_unit(id, ref, unit);
1524                 atomic_set_mask(mask, &unit->status);
1525         } else {
1526                 if (status_change_clear(mask, &unit->status))
1527                         zfcp_rec_dbf_event_unit(id, ref, unit);
1528                 atomic_clear_mask(mask, &unit->status);
1529                 if (mask & ZFCP_STATUS_COMMON_ERP_FAILED) {
1530                         atomic_set(&unit->erp_counter, 0);
1531                 }
1532         }
1533 }
1534
1535 /**
1536  * zfcp_erp_port_boxed - Mark port as "boxed" and start ERP
1537  * @port: The "boxed" port.
1538  * @id: The debug trace id.
1539  * @id: Reference for the debug trace.
1540  */
1541 void zfcp_erp_port_boxed(struct zfcp_port *port, char *id, void *ref)
1542 {
1543         unsigned long flags;
1544
1545         read_lock_irqsave(&zfcp_data.config_lock, flags);
1546         zfcp_erp_modify_port_status(port, id, ref,
1547                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1548         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1549         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1550 }
1551
1552 /**
1553  * zfcp_erp_unit_boxed - Mark unit as "boxed" and start ERP
1554  * @port: The "boxed" unit.
1555  * @id: The debug trace id.
1556  * @id: Reference for the debug trace.
1557  */
1558 void zfcp_erp_unit_boxed(struct zfcp_unit *unit, char *id, void *ref)
1559 {
1560         zfcp_erp_modify_unit_status(unit, id, ref,
1561                                     ZFCP_STATUS_COMMON_ACCESS_BOXED, ZFCP_SET);
1562         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1563 }
1564
1565 /**
1566  * zfcp_erp_port_access_denied - Adapter denied access to port.
1567  * @port: port where access has been denied
1568  * @id: id for debug trace
1569  * @ref: reference for debug trace
1570  *
1571  * Since the adapter has denied access, stop using the port and the
1572  * attached units.
1573  */
1574 void zfcp_erp_port_access_denied(struct zfcp_port *port, char *id, void *ref)
1575 {
1576         unsigned long flags;
1577
1578         read_lock_irqsave(&zfcp_data.config_lock, flags);
1579         zfcp_erp_modify_port_status(port, id, ref,
1580                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1581                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1582         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1583 }
1584
1585 /**
1586  * zfcp_erp_unit_access_denied - Adapter denied access to unit.
1587  * @unit: unit where access has been denied
1588  * @id: id for debug trace
1589  * @ref: reference for debug trace
1590  *
1591  * Since the adapter has denied access, stop using the unit.
1592  */
1593 void zfcp_erp_unit_access_denied(struct zfcp_unit *unit, char *id, void *ref)
1594 {
1595         zfcp_erp_modify_unit_status(unit, id, ref,
1596                                     ZFCP_STATUS_COMMON_ERP_FAILED |
1597                                     ZFCP_STATUS_COMMON_ACCESS_DENIED, ZFCP_SET);
1598 }
1599
1600 static void zfcp_erp_unit_access_changed(struct zfcp_unit *unit, char *id,
1601                                          void *ref)
1602 {
1603         int status = atomic_read(&unit->status);
1604         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1605                         ZFCP_STATUS_COMMON_ACCESS_BOXED)))
1606                 return;
1607
1608         zfcp_erp_unit_reopen(unit, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1609 }
1610
1611 static void zfcp_erp_port_access_changed(struct zfcp_port *port, char *id,
1612                                          void *ref)
1613 {
1614         struct zfcp_unit *unit;
1615         int status = atomic_read(&port->status);
1616
1617         if (!(status & (ZFCP_STATUS_COMMON_ACCESS_DENIED |
1618                         ZFCP_STATUS_COMMON_ACCESS_BOXED))) {
1619                 list_for_each_entry(unit, &port->unit_list_head, list)
1620                                     zfcp_erp_unit_access_changed(unit, id, ref);
1621                 return;
1622         }
1623
1624         zfcp_erp_port_reopen(port, ZFCP_STATUS_COMMON_ERP_FAILED, id, ref);
1625 }
1626
1627 /**
1628  * zfcp_erp_adapter_access_changed - Process change in adapter ACT
1629  * @adapter: Adapter where the Access Control Table (ACT) changed
1630  * @id: Id for debug trace
1631  * @ref: Reference for debug trace
1632  */
1633 void zfcp_erp_adapter_access_changed(struct zfcp_adapter *adapter, char *id,
1634                                      void *ref)
1635 {
1636         struct zfcp_port *port;
1637         unsigned long flags;
1638
1639         if (adapter->connection_features & FSF_FEATURE_NPIV_MODE)
1640                 return;
1641
1642         read_lock_irqsave(&zfcp_data.config_lock, flags);
1643         list_for_each_entry(port, &adapter->port_list_head, list)
1644                 zfcp_erp_port_access_changed(port, id, ref);
1645         read_unlock_irqrestore(&zfcp_data.config_lock, flags);
1646 }