source: branches/samba-3.5.x/source3/smbd/aio.c@ 736

Last change on this file since 736 was 414, checked in by Herwig Bauernfeind, 15 years ago

Samba 3.5.0: Initial import
File size: 21.2 KB
Line 
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
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