source3/smbd/aio.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    async_io read handling using POSIX async io.
   5    Copyright (C) Jeremy Allison 2005.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "smbd/globals.h"
  23
  24 #if defined(WITH_AIO)
  25
  26 /* The signal we'll use to signify aio done. */
  27 #ifndef RT_SIGNAL_AIO
  28 #define RT_SIGNAL_AIO   (SIGRTMIN+3)
  29 #endif
  30
  31 #ifndef HAVE_STRUCT_SIGEVENT_SIGEV_VALUE_SIVAL_PTR
  32 #ifdef HAVE_STRUCT_SIGEVENT_SIGEV_VALUE_SIGVAL_PTR
  33 #define sival_int       sigval_int
  34 #define sival_ptr       sigval_ptr
  35 #endif
  36 #endif
  37
  38 /****************************************************************************
  39  Initialize the signal handler for aio read/write.
  40 *****************************************************************************/
  41
  42 static void smbd_aio_signal_handler(struct tevent_context *ev_ctx,
  43                                     struct tevent_signal *se,
  44                                     int signum, int count,
  45                                     void *_info, void *private_data)
  46 {
  47         siginfo_t *info = (siginfo_t *)_info;
  48         /* This won't work for SMB2.
  49          * We need a mapping table from sival_int -> uint64_t mid. */
  50         uint64_t mid = (uint64_t)info->si_value.sival_int;
  51
  52         smbd_aio_complete_mid(mid);
  53 }
  54
  55
  56 static void initialize_async_io_handler(void)
  57 {
  58         if (aio_signal_event) {
  59                 return;
  60         }
  61
  62         aio_signal_event = tevent_add_signal(smbd_event_context(),
  63                                              smbd_event_context(),
  64                                              RT_SIGNAL_AIO, SA_SIGINFO,
  65                                              smbd_aio_signal_handler,
  66                                              NULL);
  67         if (!aio_signal_event) {
  68                 exit_server("Failed to setup RT_SIGNAL_AIO handler");
  69         }
  70
  71         /* tevent supports 100 signal with SA_SIGINFO */
  72         aio_pending_size = 100;
  73 }
  74
  75
  76 /****************************************************************************
  77  The buffer we keep around whilst an aio request is in process.
  78 *****************************************************************************/
  79
  80 struct aio_extra {
  81         struct aio_extra *next, *prev;
  82         SMB_STRUCT_AIOCB acb;
  83         files_struct *fsp;
  84         struct smb_request *req;
  85         char *outbuf;
  86         struct lock_struct lock;
  87         int (*handle_completion)(struct aio_extra *ex, int errcode);
  88 };
  89
  90 static int handle_aio_read_complete(struct aio_extra *aio_ex, int errcode);
  91 static int handle_aio_write_complete(struct aio_extra *aio_ex, int errcode);
  92
  93 static int aio_extra_destructor(struct aio_extra *aio_ex)
  94 {
  95         DLIST_REMOVE(aio_list_head, aio_ex);
  96         return 0;
  97 }
  98
  99 /****************************************************************************
 100  Create the extended aio struct we must keep around for the lifetime
 101  of the aio call.
 102 *****************************************************************************/
 103
 104 static struct aio_extra *create_aio_extra(files_struct *fsp, size_t buflen)
 105 {
 106         struct aio_extra *aio_ex = TALLOC_ZERO_P(NULL, struct aio_extra);
 107
 108         if (!aio_ex) {
 109                 return NULL;
 110         }
 111
 112         /* The output buffer stored in the aio_ex is the start of
 113            the smb return buffer. The buffer used in the acb
 114            is the start of the reply data portion of that buffer. */
 115
 116         aio_ex->outbuf = TALLOC_ARRAY(aio_ex, char, buflen);
 117         if (!aio_ex->outbuf) {
 118                 TALLOC_FREE(aio_ex);
 119                 return NULL;
 120         }
 121         DLIST_ADD(aio_list_head, aio_ex);
 122         talloc_set_destructor(aio_ex, aio_extra_destructor);
 123         aio_ex->fsp = fsp;
 124         return aio_ex;
 125 }
 126
 127 /****************************************************************************
 128  Given the mid find the extended aio struct containing it.
 129 *****************************************************************************/
 130
 131 static struct aio_extra *find_aio_ex(uint64_t mid)
 132 {
 133         struct aio_extra *p;
 134
 135         for( p = aio_list_head; p; p = p->next) {
 136                 if (mid == p->req->mid) {
 137                         return p;
 138                 }
 139         }
 140         return NULL;
 141 }
 142
 143 /****************************************************************************
 144  We can have these many aio buffers in flight.
 145 *****************************************************************************/
 146
 147 /****************************************************************************
 148  Set up an aio request from a SMBreadX call.
 149 *****************************************************************************/
 150
 151 NTSTATUS schedule_aio_read_and_X(connection_struct *conn,
 152                              struct smb_request *req,
 153                              files_struct *fsp, SMB_OFF_T startpos,
 154                              size_t smb_maxcnt)
 155 {
 156         struct aio_extra *aio_ex;
 157         SMB_STRUCT_AIOCB *a;
 158         size_t bufsize;
 159         size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
 160         int ret;
 161
 162         if (fsp->base_fsp != NULL) {
 163                 /* No AIO on streams yet */
 164                 DEBUG(10, ("AIO on streams not yet supported\n"));
 165                 return NT_STATUS_RETRY;
 166         }
 167
 168         if ((!min_aio_read_size || (smb_maxcnt < min_aio_read_size))
 169             && !SMB_VFS_AIO_FORCE(fsp)) {
 170                 /* Too small a read for aio request. */
 171                 DEBUG(10,("schedule_aio_read_and_X: read size (%u) too small "
 172                           "for minimum aio_read of %u\n",
 173                           (unsigned int)smb_maxcnt,
 174                           (unsigned int)min_aio_read_size ));
 175                 return NT_STATUS_RETRY;
 176         }
 177
 178         /* Only do this on non-chained and non-chaining reads not using the
 179          * write cache. */
 180         if (req_is_in_chain(req) || (lp_write_cache_size(SNUM(conn)) != 0)) {
 181                 return NT_STATUS_RETRY;
 182         }
 183
 184         if (outstanding_aio_calls >= aio_pending_size) {
 185                 DEBUG(10,("schedule_aio_read_and_X: Already have %d aio "
 186                           "activities outstanding.\n",
 187                           outstanding_aio_calls ));
 188                 return NT_STATUS_RETRY;
 189         }
 190
 191         /* The following is safe from integer wrap as we've already checked
 192            smb_maxcnt is 128k or less. Wct is 12 for read replies */
 193
 194         bufsize = smb_size + 12 * 2 + smb_maxcnt;
 195
 196         /* Ensure aio is initialized. */
 197         initialize_async_io_handler();
 198
 199         if ((aio_ex = create_aio_extra(fsp, bufsize)) == NULL) {
 200                 DEBUG(10,("schedule_aio_read_and_X: malloc fail.\n"));
 201                 return NT_STATUS_NO_MEMORY;
 202         }
 203         aio_ex->handle_completion = handle_aio_read_complete;
 204
 205         construct_reply_common_req(req, aio_ex->outbuf);
 206         srv_set_message(aio_ex->outbuf, 12, 0, True);
 207         SCVAL(aio_ex->outbuf,smb_vwv0,0xFF); /* Never a chained reply. */
 208
 209         init_strict_lock_struct(fsp, (uint64_t)req->smbpid,
 210                 (uint64_t)startpos, (uint64_t)smb_maxcnt, READ_LOCK,
 211                 &aio_ex->lock);
 212
 213         /* Take the lock until the AIO completes. */
 214         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &aio_ex->lock)) {
 215                 TALLOC_FREE(aio_ex);
 216                 return NT_STATUS_FILE_LOCK_CONFLICT;
 217         }
 218
 219         a = &aio_ex->acb;
 220
 221         /* Now set up the aio record for the read call. */
 222
 223         a->aio_fildes = fsp->fh->fd;
 224         a->aio_buf = smb_buf(aio_ex->outbuf);
 225         a->aio_nbytes = smb_maxcnt;
 226         a->aio_offset = startpos;
 227         a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
 228         a->aio_sigevent.sigev_signo  = RT_SIGNAL_AIO;
 229         a->aio_sigevent.sigev_value.sival_int = req->mid;
 230
 231         ret = SMB_VFS_AIO_READ(fsp, a);
 232         if (ret == -1) {
 233                 DEBUG(0,("schedule_aio_read_and_X: aio_read failed. "
 234                          "Error %s\n", strerror(errno) ));
 235                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &aio_ex->lock);
 236                 TALLOC_FREE(aio_ex);
 237                 return NT_STATUS_RETRY;
 238         }
 239
 240         outstanding_aio_calls++;
 241         aio_ex->req = talloc_move(aio_ex, &req);
 242
 243         DEBUG(10,("schedule_aio_read_and_X: scheduled aio_read for file %s, "
 244                   "offset %.0f, len = %u (mid = %u)\n",
 245                   fsp_str_dbg(fsp), (double)startpos, (unsigned int)smb_maxcnt,
 246                   (unsigned int)aio_ex->req->mid ));
 247
 248         return NT_STATUS_OK;
 249 }
 250
 251 /****************************************************************************
 252  Set up an aio request from a SMBwriteX call.
 253 *****************************************************************************/
 254
 255 NTSTATUS schedule_aio_write_and_X(connection_struct *conn,
 256                               struct smb_request *req,
 257                               files_struct *fsp, char *data,
 258                               SMB_OFF_T startpos,
 259                               size_t numtowrite)
 260 {
 261         struct aio_extra *aio_ex;
 262         SMB_STRUCT_AIOCB *a;
 263         size_t bufsize;
 264         bool write_through = BITSETW(req->vwv+7,0);
 265         size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
 266         int ret;
 267
 268         if (fsp->base_fsp != NULL) {
 269                 /* No AIO on streams yet */
 270                 DEBUG(10, ("AIO on streams not yet supported\n"));
 271                 return NT_STATUS_RETRY;
 272         }
 273
 274         if ((!min_aio_write_size || (numtowrite < min_aio_write_size))
 275             && !SMB_VFS_AIO_FORCE(fsp)) {
 276                 /* Too small a write for aio request. */
 277                 DEBUG(10,("schedule_aio_write_and_X: write size (%u) too "
 278                           "small for minimum aio_write of %u\n",
 279                           (unsigned int)numtowrite,
 280                           (unsigned int)min_aio_write_size ));
 281                 return NT_STATUS_RETRY;
 282         }
 283
 284         /* Only do this on non-chained and non-chaining reads not using the
 285          * write cache. */
 286         if (req_is_in_chain(req) || (lp_write_cache_size(SNUM(conn)) != 0)) {
 287                 return NT_STATUS_RETRY;
 288         }
 289
 290         if (outstanding_aio_calls >= aio_pending_size) {
 291                 DEBUG(3,("schedule_aio_write_and_X: Already have %d aio "
 292                          "activities outstanding.\n",
 293                           outstanding_aio_calls ));
 294                 DEBUG(10,("schedule_aio_write_and_X: failed to schedule "
 295                           "aio_write for file %s, offset %.0f, len = %u "
 296                           "(mid = %u)\n",
 297                           fsp_str_dbg(fsp), (double)startpos,
 298                           (unsigned int)numtowrite,
 299                           (unsigned int)req->mid ));
 300                 return NT_STATUS_RETRY;
 301         }
 302
 303         /* Ensure aio is initialized. */
 304         initialize_async_io_handler();
 305
 306         bufsize = smb_size + 6*2;
 307
 308         if (!(aio_ex = create_aio_extra(fsp, bufsize))) {
 309                 DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n"));
 310                 return NT_STATUS_NO_MEMORY;
 311         }
 312         aio_ex->handle_completion = handle_aio_write_complete;
 313
 314         construct_reply_common_req(req, aio_ex->outbuf);
 315         srv_set_message(aio_ex->outbuf, 6, 0, True);
 316         SCVAL(aio_ex->outbuf,smb_vwv0,0xFF); /* Never a chained reply. */
 317
 318         init_strict_lock_struct(fsp, (uint64_t)req->smbpid,
 319                 (uint64_t)startpos, (uint64_t)numtowrite, WRITE_LOCK,
 320                 &aio_ex->lock);
 321
 322         /* Take the lock until the AIO completes. */
 323         if (!SMB_VFS_STRICT_LOCK(conn, fsp, &aio_ex->lock)) {
 324                 TALLOC_FREE(aio_ex);
 325                 return NT_STATUS_FILE_LOCK_CONFLICT;
 326         }
 327
 328         a = &aio_ex->acb;
 329
 330         /* Now set up the aio record for the write call. */
 331
 332         a->aio_fildes = fsp->fh->fd;
 333         a->aio_buf = data;
 334         a->aio_nbytes = numtowrite;
 335         a->aio_offset = startpos;
 336         a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
 337         a->aio_sigevent.sigev_signo  = RT_SIGNAL_AIO;
 338         a->aio_sigevent.sigev_value.sival_int = req->mid;
 339
 340         ret = SMB_VFS_AIO_WRITE(fsp, a);
 341         if (ret == -1) {
 342                 DEBUG(3,("schedule_aio_wrote_and_X: aio_write failed. "
 343                          "Error %s\n", strerror(errno) ));
 344                 SMB_VFS_STRICT_UNLOCK(conn, fsp, &aio_ex->lock);
 345                 TALLOC_FREE(aio_ex);
 346                 return NT_STATUS_RETRY;
 347         }
 348
 349         outstanding_aio_calls++;
 350         aio_ex->req = talloc_move(aio_ex, &req);
 351
 352         /* This should actually be improved to span the write. */
 353         contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
 354         contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
 355
 356         if (!write_through && !lp_syncalways(SNUM(fsp->conn))
 357             && fsp->aio_write_behind) {
 358                 /* Lie to the client and immediately claim we finished the
 359                  * write. */
 360                 SSVAL(aio_ex->outbuf,smb_vwv2,numtowrite);
 361                 SSVAL(aio_ex->outbuf,smb_vwv4,(numtowrite>>16)&1);
 362                 show_msg(aio_ex->outbuf);
 363                 if (!srv_send_smb(smbd_server_fd(),aio_ex->outbuf,
 364                                 true, aio_ex->req->seqnum+1,
 365                                 IS_CONN_ENCRYPTED(fsp->conn),
 366                                 &aio_ex->req->pcd)) {
 367                         exit_server_cleanly("handle_aio_write: srv_send_smb "
 368                                             "failed.");
 369                 }
 370                 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write "
 371                           "behind for file %s\n", fsp_str_dbg(fsp)));
 372         }
 373
 374         DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write for file "
 375                   "%s, offset %.0f, len = %u (mid = %u) "
 376                   "outstanding_aio_calls = %d\n",
 377                   fsp_str_dbg(fsp), (double)startpos, (unsigned int)numtowrite,
 378                   (unsigned int)aio_ex->req->mid, outstanding_aio_calls ));
 379
 380         return NT_STATUS_OK;
 381 }
 382
 383 /****************************************************************************
 384  Complete the read and return the data or error back to the client.
 385  Returns errno or zero if all ok.
 386 *****************************************************************************/
 387
 388 static int handle_aio_read_complete(struct aio_extra *aio_ex, int errcode)
 389 {
 390         int outsize;
 391         char *outbuf = aio_ex->outbuf;
 392         char *data = smb_buf(outbuf);
 393         ssize_t nread = SMB_VFS_AIO_RETURN(aio_ex->fsp,&aio_ex->acb);
 394
 395         if (nread < 0) {
 396                 /* We're relying here on the fact that if the fd is
 397                    closed then the aio will complete and aio_return
 398                    will return an error. Hopefully this is
 399                    true.... JRA. */
 400
 401                 DEBUG( 3,( "handle_aio_read_complete: file %s nread == %d. "
 402                            "Error = %s\n",
 403                            fsp_str_dbg(aio_ex->fsp), (int)nread, strerror(errcode)));
 404
 405                 ERROR_NT(map_nt_error_from_unix(errcode));
 406                 outsize = srv_set_message(outbuf,0,0,true);
 407         } else {
 408                 outsize = srv_set_message(outbuf,12,nread,False);
 409                 SSVAL(outbuf,smb_vwv2,0xFFFF); /* Remaining - must be * -1. */
 410                 SSVAL(outbuf,smb_vwv5,nread);
 411                 SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf));
 412                 SSVAL(outbuf,smb_vwv7,((nread >> 16) & 1));
 413                 SSVAL(smb_buf(outbuf),-2,nread);
 414
 415                 aio_ex->fsp->fh->pos = aio_ex->acb.aio_offset + nread;
 416                 aio_ex->fsp->fh->position_information = aio_ex->fsp->fh->pos;
 417
 418                 DEBUG( 3, ( "handle_aio_read_complete file %s max=%d "
 419                             "nread=%d\n",
 420                             fsp_str_dbg(aio_ex->fsp),
 421                             (int)aio_ex->acb.aio_nbytes, (int)nread ) );
 422
 423         }
 424         smb_setlen(outbuf,outsize - 4);
 425         show_msg(outbuf);
 426         if (!srv_send_smb(smbd_server_fd(),outbuf,
 427                         true, aio_ex->req->seqnum+1,
 428                         IS_CONN_ENCRYPTED(aio_ex->fsp->conn), NULL)) {
 429                 exit_server_cleanly("handle_aio_read_complete: srv_send_smb "
 430                                     "failed.");
 431         }
 432
 433         DEBUG(10,("handle_aio_read_complete: scheduled aio_read completed "
 434                   "for file %s, offset %.0f, len = %u\n",
 435                   fsp_str_dbg(aio_ex->fsp), (double)aio_ex->acb.aio_offset,
 436                   (unsigned int)nread ));
 437
 438         return errcode;
 439 }
 440
 441 /****************************************************************************
 442  Complete the write and return the data or error back to the client.
 443  Returns error code or zero if all ok.
 444 *****************************************************************************/
 445
 446 static int handle_aio_write_complete(struct aio_extra *aio_ex, int errcode)
 447 {
 448         files_struct *fsp = aio_ex->fsp;
 449         char *outbuf = aio_ex->outbuf;
 450         ssize_t numtowrite = aio_ex->acb.aio_nbytes;
 451         ssize_t nwritten = SMB_VFS_AIO_RETURN(fsp,&aio_ex->acb);
 452
 453         if (fsp->aio_write_behind) {
 454                 if (nwritten != numtowrite) {
 455                         if (nwritten == -1) {
 456                                 DEBUG(5,("handle_aio_write_complete: "
 457                                          "aio_write_behind failed ! File %s "
 458                                          "is corrupt ! Error %s\n",
 459                                          fsp_str_dbg(fsp), strerror(errcode)));
 460                         } else {
 461                                 DEBUG(0,("handle_aio_write_complete: "
 462                                          "aio_write_behind failed ! File %s "
 463                                          "is corrupt ! Wanted %u bytes but "
 464                                          "only wrote %d\n", fsp_str_dbg(fsp),
 465                                          (unsigned int)numtowrite,
 466                                          (int)nwritten ));
 467                                 errcode = EIO;
 468                         }
 469                 } else {
 470                         DEBUG(10,("handle_aio_write_complete: "
 471                                   "aio_write_behind completed for file %s\n",
 472                                   fsp_str_dbg(fsp)));
 473                 }
 474                 /* TODO: should no return 0 in case of an error !!! */
 475                 return 0;
 476         }
 477
 478         /* We don't need outsize or set_message here as we've already set the
 479            fixed size length when we set up the aio call. */
 480
 481         if(nwritten == -1) {
 482                 DEBUG( 3,( "handle_aio_write: file %s wanted %u bytes. "
 483                            "nwritten == %d. Error = %s\n",
 484                            fsp_str_dbg(fsp), (unsigned int)numtowrite,
 485                            (int)nwritten, strerror(errcode) ));
 486
 487                 ERROR_NT(map_nt_error_from_unix(errcode));
 488                 srv_set_message(outbuf,0,0,true);
 489         } else {
 490                 bool write_through = BITSETW(aio_ex->req->vwv+7,0);
 491                 NTSTATUS status;
 492
 493                 SSVAL(outbuf,smb_vwv2,nwritten);
 494                 SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1);
 495                 if (nwritten < (ssize_t)numtowrite) {
 496                         SCVAL(outbuf,smb_rcls,ERRHRD);
 497                         SSVAL(outbuf,smb_err,ERRdiskfull);
 498                 }
 499
 500                 DEBUG(3,("handle_aio_write: fnum=%d num=%d wrote=%d\n",
 501                          fsp->fnum, (int)numtowrite, (int)nwritten));
 502                 status = sync_file(fsp->conn,fsp, write_through);
 503                 if (!NT_STATUS_IS_OK(status)) {
 504                         errcode = errno;
 505                         ERROR_BOTH(map_nt_error_from_unix(errcode),
 506                                    ERRHRD, ERRdiskfull);
 507                         srv_set_message(outbuf,0,0,true);
 508                         DEBUG(5,("handle_aio_write: sync_file for %s returned %s\n",
 509                                  fsp_str_dbg(fsp), nt_errstr(status)));
 510                 }
 511
 512                 aio_ex->fsp->fh->pos = aio_ex->acb.aio_offset + nwritten;
 513         }
 514
 515         show_msg(outbuf);
 516         if (!srv_send_smb(smbd_server_fd(),outbuf,
 517                           true, aio_ex->req->seqnum+1,
 518                           IS_CONN_ENCRYPTED(fsp->conn),
 519                           NULL)) {
 520                 exit_server_cleanly("handle_aio_write: srv_send_smb failed.");
 521         }
 522
 523         DEBUG(10,("handle_aio_write_complete: scheduled aio_write completed "
 524                   "for file %s, offset %.0f, requested %u, written = %u\n",
 525                   fsp_str_dbg(fsp), (double)aio_ex->acb.aio_offset,
 526                   (unsigned int)numtowrite, (unsigned int)nwritten ));
 527
 528         return errcode;
 529 }
 530
 531 /****************************************************************************
 532  Handle any aio completion. Returns True if finished (and sets *perr if err
 533  was non-zero), False if not.
 534 *****************************************************************************/
 535
 536 static bool handle_aio_completed(struct aio_extra *aio_ex, int *perr)
 537 {
 538         files_struct *fsp = NULL;
 539         int err;
 540
 541         if(!aio_ex) {
 542                 DEBUG(3, ("handle_aio_completed: Non-existing aio_ex passed\n"));
 543                 return false;
 544         }
 545
 546         fsp = aio_ex->fsp;
 547
 548         /* Ensure the operation has really completed. */
 549         err = SMB_VFS_AIO_ERROR(fsp, &aio_ex->acb);
 550         if (err == EINPROGRESS) {
 551                 DEBUG(10,( "handle_aio_completed: operation mid %llu still in "
 552                         "process for file %s\n",
 553                         (unsigned long long)aio_ex->req->mid,
 554                         fsp_str_dbg(aio_ex->fsp)));
 555                 return False;
 556         }
 557
 558         /* Unlock now we're done. */
 559         SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &aio_ex->lock);
 560
 561         if (err == ECANCELED) {
 562                 /* If error is ECANCELED then don't return anything to the
 563                  * client. */
 564                 DEBUG(10,( "handle_aio_completed: operation mid %llu"
 565                         " canceled\n",
 566                         (unsigned long long)aio_ex->req->mid));
 567                 return True;
 568         }
 569
 570         err = aio_ex->handle_completion(aio_ex, err);
 571         if (err) {
 572                 *perr = err; /* Only save non-zero errors. */
 573         }
 574
 575         return True;
 576 }
 577
 578 /****************************************************************************
 579  Handle any aio completion inline.
 580 *****************************************************************************/
 581
 582 void smbd_aio_complete_mid(uint64_t mid)
 583 {
 584         files_struct *fsp = NULL;
 585         struct aio_extra *aio_ex = find_aio_ex(mid);
 586         int ret = 0;
 587
 588         outstanding_aio_calls--;
 589
 590         DEBUG(10,("smbd_aio_complete_mid: mid[%llu]\n",
 591                 (unsigned long long)mid));
 592
 593         if (!aio_ex) {
 594                 DEBUG(3,("smbd_aio_complete_mid: Can't find record to "
 595                         "match mid %llu.\n",
 596                         (unsigned long long)mid));
 597                 return;
 598         }
 599
 600         fsp = aio_ex->fsp;
 601         if (fsp == NULL) {
 602                 /* file was closed whilst I/O was outstanding. Just
 603                  * ignore. */
 604                 DEBUG( 3,( "smbd_aio_complete_mid: file closed whilst "
 605                         "aio outstanding (mid[%llu]).\n",
 606                         (unsigned long long)mid));
 607                 return;
 608         }
 609
 610         if (!handle_aio_completed(aio_ex, &ret)) {
 611                 return;
 612         }
 613
 614         TALLOC_FREE(aio_ex);
 615 }
 616
 617 /****************************************************************************
 618  We're doing write behind and the client closed the file. Wait up to 30
 619  seconds (my arbitrary choice) for the aio to complete. Return 0 if all writes
 620  completed, errno to return if not.
 621 *****************************************************************************/
 622
 623 #define SMB_TIME_FOR_AIO_COMPLETE_WAIT 29
 624
 625 int wait_for_aio_completion(files_struct *fsp)
 626 {
 627         struct aio_extra *aio_ex;
 628         const SMB_STRUCT_AIOCB **aiocb_list;
 629         int aio_completion_count = 0;
 630         time_t start_time = time(NULL);
 631         int seconds_left;
 632
 633         for (seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT;
 634              seconds_left >= 0;) {
 635                 int err = 0;
 636                 int i;
 637                 struct timespec ts;
 638
 639                 aio_completion_count = 0;
 640                 for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) {
 641                         if (aio_ex->fsp == fsp) {
 642                                 aio_completion_count++;
 643                         }
 644                 }
 645
 646                 if (!aio_completion_count) {
 647                         return 0;
 648                 }
 649
 650                 DEBUG(3,("wait_for_aio_completion: waiting for %d aio events "
 651                          "to complete.\n", aio_completion_count ));
 652
 653                 aiocb_list = SMB_MALLOC_ARRAY(const SMB_STRUCT_AIOCB *,
 654                                               aio_completion_count);
 655                 if (!aiocb_list) {
 656                         return ENOMEM;
 657                 }
 658
 659                 for( i = 0, aio_ex = aio_list_head;
 660                      aio_ex;
 661                      aio_ex = aio_ex->next) {
 662                         if (aio_ex->fsp == fsp) {
 663                                 aiocb_list[i++] = &aio_ex->acb;
 664                         }
 665                 }
 666
 667                 /* Now wait up to seconds_left for completion. */
 668                 ts.tv_sec = seconds_left;
 669                 ts.tv_nsec = 0;
 670
 671                 DEBUG(10,("wait_for_aio_completion: %d events, doing a wait "
 672                           "of %d seconds.\n",
 673                           aio_completion_count, seconds_left ));
 674
 675                 err = SMB_VFS_AIO_SUSPEND(fsp, aiocb_list,
 676                                           aio_completion_count, &ts);
 677
 678                 DEBUG(10,("wait_for_aio_completion: returned err = %d, "
 679                           "errno = %s\n", err, strerror(errno) ));
 680
 681                 if (err == -1 && errno == EAGAIN) {
 682                         DEBUG(0,("wait_for_aio_completion: aio_suspend timed "
 683                                  "out waiting for %d events after a wait of "
 684                                  "%d seconds\n", aio_completion_count,
 685                                  seconds_left));
 686                         /* Timeout. */
 687                         cancel_aio_by_fsp(fsp);
 688                         SAFE_FREE(aiocb_list);
 689                         return EIO;
 690                 }
 691
 692                 /* One or more events might have completed - process them if
 693                  * so. */
 694                 for( i = 0; i < aio_completion_count; i++) {
 695                         /* FIXME. Won't work for SMB2. */
 696                         uint64_t mid = (uint64_t)aiocb_list[i]->aio_sigevent.sigev_value.sival_int;
 697
 698                         aio_ex = find_aio_ex(mid);
 699
 700                         if (!aio_ex) {
 701                                 DEBUG(0, ("wait_for_aio_completion: mid %llu "
 702                                           "doesn't match an aio record\n",
 703                                           (unsigned long long)mid ));
 704                                 continue;
 705                         }
 706
 707                         if (!handle_aio_completed(aio_ex, &err)) {
 708                                 continue;
 709                         }
 710                         TALLOC_FREE(aio_ex);
 711                 }
 712
 713                 SAFE_FREE(aiocb_list);
 714                 seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT
 715                         - (time(NULL) - start_time);
 716         }
 717
 718         /* We timed out - we don't know why. Return ret if already an error,
 719          * else EIO. */
 720         DEBUG(10,("wait_for_aio_completion: aio_suspend timed out waiting "
 721                   "for %d events\n",
 722                   aio_completion_count));
 723
 724         return EIO;
 725 }
 726
 727 /****************************************************************************
 728  Cancel any outstanding aio requests. The client doesn't care about the reply.
 729 *****************************************************************************/
 730
 731 void cancel_aio_by_fsp(files_struct *fsp)
 732 {
 733         struct aio_extra *aio_ex;
 734
 735         for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) {
 736                 if (aio_ex->fsp == fsp) {
 737                         /* Unlock now we're done. */
 738                         SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &aio_ex->lock);
 739
 740                         /* Don't delete the aio_extra record as we may have
 741                            completed and don't yet know it. Just do the
 742                            aio_cancel call and return. */
 743                         SMB_VFS_AIO_CANCEL(fsp, &aio_ex->acb);
 744                         aio_ex->fsp = NULL; /* fsp will be closed when we
 745                                              * return. */
 746                 }
 747         }
 748 }
 749
 750 #else
 751 NTSTATUS schedule_aio_read_and_X(connection_struct *conn,
 752                              struct smb_request *req,
 753                              files_struct *fsp, SMB_OFF_T startpos,
 754                              size_t smb_maxcnt)
 755 {
 756         return NT_STATUS_RETRY;
 757 }
 758
 759 NTSTATUS schedule_aio_write_and_X(connection_struct *conn,
 760                               struct smb_request *req,
 761                               files_struct *fsp, char *data,
 762                               SMB_OFF_T startpos,
 763                               size_t numtowrite)
 764 {
 765         return NT_STATUS_RETRY;
 766 }
 767
 768 void cancel_aio_by_fsp(files_struct *fsp)
 769 {
 770 }
 771
 772 int wait_for_aio_completion(files_struct *fsp)
 773 {
 774         return ENOSYS;
 775 }
 776
 777 void smbd_aio_complete_mid(uint64_t mid);
 778
 779 #endif