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 42struct aio_extra { 43 struct aio_extra *next, *prev; 44 SMB_STRUCT_AIOCB acb; 45 files_struct *fsp; 46 struct smb_request *req; 47 char *outbuf; 48 int (*handle_completion)(struct aio_extra *ex, int errcode); 49}; 50 51static int handle_aio_read_complete(struct aio_extra *aio_ex, int errcode); 52static int handle_aio_write_complete(struct aio_extra *aio_ex, int errcode); 53 54static int aio_extra_destructor(struct aio_extra *aio_ex) 55{ 56 DLIST_REMOVE(aio_list_head, aio_ex); 57 return 0; 58} 59 60/**************************************************************************** 61 Create the extended aio struct we must keep around for the lifetime 62 of the aio call. 63*****************************************************************************/ 64 65static struct aio_extra *create_aio_extra(files_struct *fsp, size_t buflen) 66{ 67 struct aio_extra *aio_ex = TALLOC_ZERO_P(NULL, struct aio_extra); 68 69 if (!aio_ex) { 70 return NULL; 71 } 72 73 /* The output buffer stored in the aio_ex is the start of 74 the smb return buffer. The buffer used in the acb 75 is the start of the reply data portion of that buffer. */ 76 77 aio_ex->outbuf = TALLOC_ARRAY(aio_ex, char, buflen); 78 if (!aio_ex->outbuf) { 79 TALLOC_FREE(aio_ex); 80 return NULL; 81 } 82 DLIST_ADD(aio_list_head, aio_ex); 83 talloc_set_destructor(aio_ex, aio_extra_destructor); 84 aio_ex->fsp = fsp; 85 return aio_ex; 86} 87 88/**************************************************************************** 89 Given the mid find the extended aio struct containing it. 90*****************************************************************************/ 91 92static struct aio_extra *find_aio_ex(uint16 mid) 93{ 94 struct aio_extra *p; 95 96 for( p = aio_list_head; p; p = p->next) { 97 if (mid == p->req->mid) { 98 return p; 99 } 100 } 101 return NULL; 102} 103 104/**************************************************************************** 105 We can have these many aio buffers in flight. 106*****************************************************************************/ 107 108/**************************************************************************** 109 Set up an aio request from a SMBreadX call. 110*****************************************************************************/ 111 112bool schedule_aio_read_and_X(connection_struct *conn, 113 struct smb_request *req, 114 files_struct *fsp, SMB_OFF_T startpos, 115 size_t smb_maxcnt) 116{ 117 struct aio_extra *aio_ex; 118 SMB_STRUCT_AIOCB *a; 119 size_t bufsize; 120 size_t min_aio_read_size = lp_aio_read_size(SNUM(conn)); 121 int ret; 122 123 if (fsp->base_fsp != NULL) { 124 /* No AIO on streams yet */ 125 DEBUG(10, ("AIO on streams not yet supported\n")); 126 return false; 127 } 128 129 if ((!min_aio_read_size || (smb_maxcnt < min_aio_read_size)) 130 && !SMB_VFS_AIO_FORCE(fsp)) { 131 /* Too small a read for aio request. */ 132 DEBUG(10,("schedule_aio_read_and_X: read size (%u) too small " 133 "for minimum aio_read of %u\n", 134 (unsigned int)smb_maxcnt, 135 (unsigned int)min_aio_read_size )); 136 return False; 137 } 138 139 /* Only do this on non-chained and non-chaining reads not using the 140 * write cache. */ 141 if (req_is_in_chain(req) || (lp_write_cache_size(SNUM(conn)) != 0)) { 142 return False; 143 } 144 145 if (outstanding_aio_calls >= aio_pending_size) { 146 DEBUG(10,("schedule_aio_read_and_X: Already have %d aio " 147 "activities outstanding.\n", 148 outstanding_aio_calls )); 149 return False; 150 } 151 152 /* The following is safe from integer wrap as we've already checked 153 smb_maxcnt is 128k or less. Wct is 12 for read replies */ 154 155 bufsize = smb_size + 12 * 2 + smb_maxcnt; 156 157 if ((aio_ex = create_aio_extra(fsp, bufsize)) == NULL) { 158 DEBUG(10,("schedule_aio_read_and_X: malloc fail.\n")); 159 return False; 160 } 161 aio_ex->handle_completion = handle_aio_read_complete; 162 163 construct_reply_common_req(req, aio_ex->outbuf); 164 srv_set_message(aio_ex->outbuf, 12, 0, True); 165 SCVAL(aio_ex->outbuf,smb_vwv0,0xFF); /* Never a chained reply. */ 166 167 a = &aio_ex->acb; 168 169 /* Now set up the aio record for the read call. */ 170 171 a->aio_fildes = fsp->fh->fd; 172 a->aio_buf = smb_buf(aio_ex->outbuf); 173 a->aio_nbytes = smb_maxcnt; 174 a->aio_offset = startpos; 175 a->aio_sigevent.sigev_notify = SIGEV_SIGNAL; 176 a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO; 177 a->aio_sigevent.sigev_value.sival_int = req->mid; 178 179 ret = SMB_VFS_AIO_READ(fsp, a); 180 if (ret == -1) { 181 DEBUG(0,("schedule_aio_read_and_X: aio_read failed. " 182 "Error %s\n", strerror(errno) )); 183 TALLOC_FREE(aio_ex); 184 return False; 185 } 186 187 outstanding_aio_calls++; 188 aio_ex->req = talloc_move(aio_ex, &req); 189 190 DEBUG(10,("schedule_aio_read_and_X: scheduled aio_read for file %s, " 191 "offset %.0f, len = %u (mid = %u)\n", 192 fsp_str_dbg(fsp), (double)startpos, (unsigned int)smb_maxcnt, 193 (unsigned int)aio_ex->req->mid )); 194 195 return True; 196} 197 198/**************************************************************************** 199 Set up an aio request from a SMBwriteX call. 200*****************************************************************************/ 201 202bool schedule_aio_write_and_X(connection_struct *conn, 203 struct smb_request *req, 204 files_struct *fsp, char *data, 205 SMB_OFF_T startpos, 206 size_t numtowrite) 207{ 208 struct aio_extra *aio_ex; 209 SMB_STRUCT_AIOCB *a; 210 size_t bufsize; 211 bool write_through = BITSETW(req->vwv+7,0); 212 size_t min_aio_write_size = lp_aio_write_size(SNUM(conn)); 213 int ret; 214 215 if (fsp->base_fsp != NULL) { 216 /* No AIO on streams yet */ 217 DEBUG(10, ("AIO on streams not yet supported\n")); 218 return false; 219 } 220 221 if ((!min_aio_write_size || (numtowrite < min_aio_write_size)) 222 && !SMB_VFS_AIO_FORCE(fsp)) { 223 /* Too small a write for aio request. */ 224 DEBUG(10,("schedule_aio_write_and_X: write size (%u) too " 225 "small for minimum aio_write of %u\n", 226 (unsigned int)numtowrite, 227 (unsigned int)min_aio_write_size )); 228 return False; 229 } 230 231 /* Only do this on non-chained and non-chaining reads not using the 232 * write cache. */ 233 if (req_is_in_chain(req) || (lp_write_cache_size(SNUM(conn)) != 0)) { 234 return False; 235 } 236 237 if (outstanding_aio_calls >= aio_pending_size) { 238 DEBUG(3,("schedule_aio_write_and_X: Already have %d aio " 239 "activities outstanding.\n", 240 outstanding_aio_calls )); 241 DEBUG(10,("schedule_aio_write_and_X: failed to schedule " 242 "aio_write for file %s, offset %.0f, len = %u " 243 "(mid = %u)\n", 244 fsp_str_dbg(fsp), (double)startpos, 245 (unsigned int)numtowrite, 246 (unsigned int)req->mid )); 247 return False; 248 } 249 250 bufsize = smb_size + 6*2; 251 252 if (!(aio_ex = create_aio_extra(fsp, bufsize))) { 253 DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n")); 254 return False; 255 } 256 aio_ex->handle_completion = handle_aio_write_complete; 257 258 construct_reply_common_req(req, aio_ex->outbuf); 259 srv_set_message(aio_ex->outbuf, 6, 0, True); 260 SCVAL(aio_ex->outbuf,smb_vwv0,0xFF); /* Never a chained reply. */ 261 262 a = &aio_ex->acb; 263 264 /* Now set up the aio record for the write call. */ 265 266 a->aio_fildes = fsp->fh->fd; 267 a->aio_buf = data; 268 a->aio_nbytes = numtowrite; 269 a->aio_offset = startpos; 270 a->aio_sigevent.sigev_notify = SIGEV_SIGNAL; 271 a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO; 272 a->aio_sigevent.sigev_value.sival_int = req->mid; 273 274 ret = SMB_VFS_AIO_WRITE(fsp, a); 275 if (ret == -1) { 276 DEBUG(3,("schedule_aio_wrote_and_X: aio_write failed. " 277 "Error %s\n", strerror(errno) )); 278 TALLOC_FREE(aio_ex); 279 return False; 280 } 281 282 outstanding_aio_calls++; 283 aio_ex->req = talloc_move(aio_ex, &req); 284 285 /* This should actually be improved to span the write. */ 286 contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE); 287 contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE); 288 289 if (!write_through && !lp_syncalways(SNUM(fsp->conn)) 290 && fsp->aio_write_behind) { 291 /* Lie to the client and immediately claim we finished the 292 * write. */ 293 SSVAL(aio_ex->outbuf,smb_vwv2,numtowrite); 294 SSVAL(aio_ex->outbuf,smb_vwv4,(numtowrite>>16)&1); 295 show_msg(aio_ex->outbuf); 296 if (!srv_send_smb(smbd_server_fd(),aio_ex->outbuf, 297 true, aio_ex->req->seqnum+1, 298 IS_CONN_ENCRYPTED(fsp->conn), 299 &aio_ex->req->pcd)) { 300 exit_server_cleanly("handle_aio_write: srv_send_smb " 301 "failed."); 302 } 303 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write " 304 "behind for file %s\n", fsp_str_dbg(fsp))); 305 } 306 307 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write for file " 308 "%s, offset %.0f, len = %u (mid = %u) " 309 "outstanding_aio_calls = %d\n", 310 fsp_str_dbg(fsp), (double)startpos, (unsigned int)numtowrite, 311 (unsigned int)aio_ex->req->mid, outstanding_aio_calls )); 312 313 return True; 314} 315 316 317/**************************************************************************** 318 Complete the read and return the data or error back to the client. 319 Returns errno or zero if all ok. 320*****************************************************************************/ 321 322static int handle_aio_read_complete(struct aio_extra *aio_ex, int errcode) 323{ 324 int outsize; 325 char *outbuf = aio_ex->outbuf; 326 char *data = smb_buf(outbuf); 327 ssize_t nread = SMB_VFS_AIO_RETURN(aio_ex->fsp,&aio_ex->acb); 328 329 if (nread < 0) { 330 /* We're relying here on the fact that if the fd is 331 closed then the aio will complete and aio_return 332 will return an error. Hopefully this is 333 true.... JRA. */ 334 335 DEBUG( 3,( "handle_aio_read_complete: file %s nread == %d. " 336 "Error = %s\n", 337 fsp_str_dbg(aio_ex->fsp), (int)nread, strerror(errcode))); 338 339 ERROR_NT(map_nt_error_from_unix(errcode)); 340 outsize = srv_set_message(outbuf,0,0,true); 341 } else { 342 outsize = srv_set_message(outbuf,12,nread,False); 343 SSVAL(outbuf,smb_vwv2,0xFFFF); /* Remaining - must be * -1. */ 344 SSVAL(outbuf,smb_vwv5,nread); 345 SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf)); 346 SSVAL(outbuf,smb_vwv7,((nread >> 16) & 1)); 347 SSVAL(smb_buf(outbuf),-2,nread); 348 349 aio_ex->fsp->fh->pos = aio_ex->acb.aio_offset + nread; 350 aio_ex->fsp->fh->position_information = aio_ex->fsp->fh->pos; 351 352 DEBUG( 3, ( "handle_aio_read_complete file %s max=%d " 353 "nread=%d\n", 354 fsp_str_dbg(aio_ex->fsp), 355 (int)aio_ex->acb.aio_nbytes, (int)nread ) ); 356 357 } 358 smb_setlen(outbuf,outsize - 4); 359 show_msg(outbuf); 360 if (!srv_send_smb(smbd_server_fd(),outbuf, 361 true, aio_ex->req->seqnum+1, 362 IS_CONN_ENCRYPTED(aio_ex->fsp->conn), NULL)) { 363 exit_server_cleanly("handle_aio_read_complete: srv_send_smb " 364 "failed."); 365 } 366 367 DEBUG(10,("handle_aio_read_complete: scheduled aio_read completed " 368 "for file %s, offset %.0f, len = %u\n", 369 fsp_str_dbg(aio_ex->fsp), (double)aio_ex->acb.aio_offset, 370 (unsigned int)nread )); 371 372 return errcode; 373} 374 375/**************************************************************************** 376 Complete the write and return the data or error back to the client. 377 Returns error code or zero if all ok. 378*****************************************************************************/ 379 380static int handle_aio_write_complete(struct aio_extra *aio_ex, int errcode) 381{ 382 files_struct *fsp = aio_ex->fsp; 383 char *outbuf = aio_ex->outbuf; 384 ssize_t numtowrite = aio_ex->acb.aio_nbytes; 385 ssize_t nwritten = SMB_VFS_AIO_RETURN(fsp,&aio_ex->acb); 386 387 if (fsp->aio_write_behind) { 388 if (nwritten != numtowrite) { 389 if (nwritten == -1) { 390 DEBUG(5,("handle_aio_write_complete: " 391 "aio_write_behind failed ! File %s " 392 "is corrupt ! Error %s\n", 393 fsp_str_dbg(fsp), strerror(errcode))); 394 } else { 395 DEBUG(0,("handle_aio_write_complete: " 396 "aio_write_behind failed ! File %s " 397 "is corrupt ! Wanted %u bytes but " 398 "only wrote %d\n", fsp_str_dbg(fsp), 399 (unsigned int)numtowrite, 400 (int)nwritten )); 401 errcode = EIO; 402 } 403 } else { 404 DEBUG(10,("handle_aio_write_complete: " 405 "aio_write_behind completed for file %s\n", 406 fsp_str_dbg(fsp))); 407 } 408 /* TODO: should no return 0 in case of an error !!! */ 409 return 0; 410 } 411 412 /* We don't need outsize or set_message here as we've already set the 413 fixed size length when we set up the aio call. */ 414 415 if(nwritten == -1) { 416 DEBUG( 3,( "handle_aio_write: file %s wanted %u bytes. " 417 "nwritten == %d. Error = %s\n", 418 fsp_str_dbg(fsp), (unsigned int)numtowrite, 419 (int)nwritten, strerror(errcode) )); 420 421 ERROR_NT(map_nt_error_from_unix(errcode)); 422 srv_set_message(outbuf,0,0,true); 423 } else { 424 bool write_through = BITSETW(aio_ex->req->vwv+7,0); 425 NTSTATUS status; 426 427 SSVAL(outbuf,smb_vwv2,nwritten); 428 SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1); 429 if (nwritten < (ssize_t)numtowrite) { 430 SCVAL(outbuf,smb_rcls,ERRHRD); 431 SSVAL(outbuf,smb_err,ERRdiskfull); 432 } 433 434 DEBUG(3,("handle_aio_write: fnum=%d num=%d wrote=%d\n", 435 fsp->fnum, (int)numtowrite, (int)nwritten)); 436 status = sync_file(fsp->conn,fsp, write_through); 437 if (!NT_STATUS_IS_OK(status)) { 438 errcode = errno; 439 ERROR_BOTH(map_nt_error_from_unix(errcode), 440 ERRHRD, ERRdiskfull); 441 srv_set_message(outbuf,0,0,true); 442 DEBUG(5,("handle_aio_write: sync_file for %s returned %s\n", 443 fsp_str_dbg(fsp), nt_errstr(status))); 444 } 445 446 aio_ex->fsp->fh->pos = aio_ex->acb.aio_offset + nwritten; 447 } 448 449 show_msg(outbuf); 450 if (!srv_send_smb(smbd_server_fd(),outbuf, 451 true, aio_ex->req->seqnum+1, 452 IS_CONN_ENCRYPTED(fsp->conn), 453 NULL)) { 454 exit_server_cleanly("handle_aio_write: srv_send_smb failed."); 455 } 456 457 DEBUG(10,("handle_aio_write_complete: scheduled aio_write completed " 458 "for file %s, offset %.0f, requested %u, written = %u\n", 459 fsp_str_dbg(fsp), (double)aio_ex->acb.aio_offset, 460 (unsigned int)numtowrite, (unsigned int)nwritten )); 461 462 return errcode; 463} 464 465/**************************************************************************** 466 Handle any aio completion. Returns True if finished (and sets *perr if err 467 was non-zero), False if not. 468*****************************************************************************/ 469 470static bool handle_aio_completed(struct aio_extra *aio_ex, int *perr) 471{ 472 int err; 473 474 if(!aio_ex) { 475 DEBUG(3, ("handle_aio_completed: Non-existing aio_ex passed\n")); 476 return false; 477 } 478 479 /* Ensure the operation has really completed. */ 480 err = SMB_VFS_AIO_ERROR(aio_ex->fsp, &aio_ex->acb); 481 if (err == EINPROGRESS) { 482 DEBUG(10,( "handle_aio_completed: operation mid %u still in " 483 "process for file %s\n", 484 aio_ex->req->mid, fsp_str_dbg(aio_ex->fsp))); 485 return False; 486 } else if (err == ECANCELED) { 487 /* If error is ECANCELED then don't return anything to the 488 * client. */ 489 DEBUG(10,( "handle_aio_completed: operation mid %u" 490 " canceled\n", aio_ex->req->mid)); 491 return True; 492 } 493 494 err = aio_ex->handle_completion(aio_ex, err); 495 if (err) { 496 *perr = err; /* Only save non-zero errors. */ 497 } 498 499 return True; 500} 501 502/**************************************************************************** 503 Handle any aio completion inline. 504*****************************************************************************/ 505 506void smbd_aio_complete_mid(unsigned int mid) 507{ 508 files_struct *fsp = NULL; 509 struct aio_extra *aio_ex = find_aio_ex(mid); 510 int ret = 0; 511 512 outstanding_aio_calls--; 513 514 DEBUG(10,("smbd_aio_complete_mid: mid[%u]\n", mid)); 515 516 if (!aio_ex) { 517 DEBUG(3,("smbd_aio_complete_mid: Can't find record to " 518 "match mid %u.\n", mid)); 519 return; 520 } 521 522 fsp = aio_ex->fsp; 523 if (fsp == NULL) { 524 /* file was closed whilst I/O was outstanding. Just 525 * ignore. */ 526 DEBUG( 3,( "smbd_aio_complete_mid: file closed whilst " 527 "aio outstanding (mid[%u]).\n", mid)); 528 return; 529 } 530 531 if (!handle_aio_completed(aio_ex, &ret)) { 532 return; 533 } 534 535 TALLOC_FREE(aio_ex); 536} 537 538static void smbd_aio_signal_handler(struct tevent_context *ev_ctx, 539 struct tevent_signal *se, 540 int signum, int count, 541 void *_info, void *private_data) 542{ 543 siginfo_t *info = (siginfo_t *)_info; 544 unsigned int mid = (unsigned int)info->si_value.sival_int; 545 546 smbd_aio_complete_mid(mid); 547} 548 549/**************************************************************************** 550 We're doing write behind and the client closed the file. Wait up to 30 551 seconds (my arbitrary choice) for the aio to complete. Return 0 if all writes 552 completed, errno to return if not. 553*****************************************************************************/ 554 555#define SMB_TIME_FOR_AIO_COMPLETE_WAIT 29 556 557int wait_for_aio_completion(files_struct *fsp) 558{ 559 struct aio_extra *aio_ex; 560 const SMB_STRUCT_AIOCB **aiocb_list; 561 int aio_completion_count = 0; 562 time_t start_time = time(NULL); 563 int seconds_left; 564 565 for (seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT; 566 seconds_left >= 0;) { 567 int err = 0; 568 int i; 569 struct timespec ts; 570 571 aio_completion_count = 0; 572 for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) { 573 if (aio_ex->fsp == fsp) { 574 aio_completion_count++; 575 } 576 } 577 578 if (!aio_completion_count) { 579 return 0; 580 } 581 582 DEBUG(3,("wait_for_aio_completion: waiting for %d aio events " 583 "to complete.\n", aio_completion_count )); 584 585 aiocb_list = SMB_MALLOC_ARRAY(const SMB_STRUCT_AIOCB *, 586 aio_completion_count); 587 if (!aiocb_list) { 588 return ENOMEM; 589 } 590 591 for( i = 0, aio_ex = aio_list_head; 592 aio_ex; 593 aio_ex = aio_ex->next) { 594 if (aio_ex->fsp == fsp) { 595 aiocb_list[i++] = &aio_ex->acb; 596 } 597 } 598 599 /* Now wait up to seconds_left for completion. */ 600 ts.tv_sec = seconds_left; 601 ts.tv_nsec = 0; 602 603 DEBUG(10,("wait_for_aio_completion: %d events, doing a wait " 604 "of %d seconds.\n", 605 aio_completion_count, seconds_left )); 606 607 err = SMB_VFS_AIO_SUSPEND(fsp, aiocb_list, 608 aio_completion_count, &ts); 609 610 DEBUG(10,("wait_for_aio_completion: returned err = %d, " 611 "errno = %s\n", err, strerror(errno) )); 612 613 if (err == -1 && errno == EAGAIN) { 614 DEBUG(0,("wait_for_aio_completion: aio_suspend timed " 615 "out waiting for %d events after a wait of " 616 "%d seconds\n", aio_completion_count, 617 seconds_left)); 618 /* Timeout. */ 619 cancel_aio_by_fsp(fsp); 620 SAFE_FREE(aiocb_list); 621 return EIO; 622 } 623 624 /* One or more events might have completed - process them if 625 * so. */ 626 for( i = 0; i < aio_completion_count; i++) { 627 uint16 mid = aiocb_list[i]->aio_sigevent.sigev_value.sival_int; 628 629 aio_ex = find_aio_ex(mid); 630 631 if (!aio_ex) { 632 DEBUG(0, ("wait_for_aio_completion: mid %u " 633 "doesn't match an aio record\n", 634 (unsigned int)mid )); 635 continue; 636 } 637 638 if (!handle_aio_completed(aio_ex, &err)) { 639 continue; 640 } 641 TALLOC_FREE(aio_ex); 642 } 643 644 SAFE_FREE(aiocb_list); 645 seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT 646 - (time(NULL) - start_time); 647 } 648 649 /* We timed out - we don't know why. Return ret if already an error, 650 * else EIO. */ 651 DEBUG(10,("wait_for_aio_completion: aio_suspend timed out waiting " 652 "for %d events\n", 653 aio_completion_count)); 654 655 return EIO; 656} 657 658/**************************************************************************** 659 Cancel any outstanding aio requests. The client doesn't care about the reply. 660*****************************************************************************/ 661 662void cancel_aio_by_fsp(files_struct *fsp) 663{ 664 struct aio_extra *aio_ex; 665 666 for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) { 667 if (aio_ex->fsp == fsp) { 668 /* Don't delete the aio_extra record as we may have 669 completed and don't yet know it. Just do the 670 aio_cancel call and return. */ 671 SMB_VFS_AIO_CANCEL(fsp, &aio_ex->acb); 672 aio_ex->fsp = NULL; /* fsp will be closed when we 673 * return. */ 674 } 675 } 676} 677 678/**************************************************************************** 679 Initialize the signal handler for aio read/write. 680*****************************************************************************/ 681 682void initialize_async_io_handler(void) 683{ 684 aio_signal_event = tevent_add_signal(smbd_event_context(), 685 smbd_event_context(), 686 RT_SIGNAL_AIO, SA_SIGINFO, 687 smbd_aio_signal_handler, 688 NULL); 689 if (!aio_signal_event) { 690 exit_server("Failed to setup RT_SIGNAL_AIO handler"); 691 } 692 693 /* tevent supports 100 signal with SA_SIGINFO */ 694 aio_pending_size = 100; 695} 696 697#else 698void initialize_async_io_handler(void) 699{ 700} 701 702bool schedule_aio_read_and_X(connection_struct *conn, 703 struct smb_request *req, 704 files_struct *fsp, SMB_OFF_T startpos, 705 size_t smb_maxcnt) 706{ 707 return False; 708} 709 710bool schedule_aio_write_and_X(connection_struct *conn, 711 struct smb_request *req, 712 files_struct *fsp, char *data, 713 SMB_OFF_T startpos, 714 size_t numtowrite) 715{ 716 return False; 717} 718 719void cancel_aio_by_fsp(files_struct *fsp) 720{ 721} 722 723int wait_for_aio_completion(files_struct *fsp) 724{ 725 return ENOSYS; 726} 727 728void smbd_aio_complete_mid(unsigned int mid); 729 730#endif 731