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