source: branches/samba-3.0/source/smbd/aio.c

Last change on this file was 165, checked in by Paul Smedley, 16 years ago

Add 'missing' 3.0.34 diffs
File size: 23.4 KB
RevLine 
[44]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 2 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, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20*/
21
22#include "includes.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/****************************************************************************
32 The buffer we keep around whilst an aio request is in process.
33*****************************************************************************/
34
35struct aio_extra {
36 struct aio_extra *next, *prev;
37 SMB_STRUCT_AIOCB acb;
38 files_struct *fsp;
39 BOOL read_req;
40 uint16 mid;
41 char *inbuf;
42 char *outbuf;
43};
44
45static struct aio_extra *aio_list_head;
46
47/****************************************************************************
48 Create the extended aio struct we must keep around for the lifetime
49 of the aio_read call.
50*****************************************************************************/
51
52static struct aio_extra *create_aio_ex_read(files_struct *fsp, size_t buflen,
53 uint16 mid)
54{
55 struct aio_extra *aio_ex = SMB_MALLOC_P(struct aio_extra);
56
57 if (!aio_ex) {
58 return NULL;
59 }
60 ZERO_STRUCTP(aio_ex);
61 /* The output buffer stored in the aio_ex is the start of
62 the smb return buffer. The buffer used in the acb
63 is the start of the reply data portion of that buffer. */
64 aio_ex->outbuf = SMB_MALLOC_ARRAY(char, buflen);
65 if (!aio_ex->outbuf) {
66 SAFE_FREE(aio_ex);
67 return NULL;
68 }
69 DLIST_ADD(aio_list_head, aio_ex);
70 aio_ex->fsp = fsp;
71 aio_ex->read_req = True;
72 aio_ex->mid = mid;
73 return aio_ex;
74}
75
76/****************************************************************************
77 Create the extended aio struct we must keep around for the lifetime
78 of the aio_write call.
79*****************************************************************************/
80
81static struct aio_extra *create_aio_ex_write(files_struct *fsp,
82 size_t inbuflen,
83 size_t outbuflen,
84 uint16 mid)
85{
86 struct aio_extra *aio_ex = SMB_MALLOC_P(struct aio_extra);
87
88 if (!aio_ex) {
89 return NULL;
90 }
91 ZERO_STRUCTP(aio_ex);
92
93 /* We need space for an output reply of outbuflen bytes. */
94 aio_ex->outbuf = SMB_MALLOC_ARRAY(char, outbuflen);
95 if (!aio_ex->outbuf) {
96 SAFE_FREE(aio_ex);
97 return NULL;
98 }
99
100 if (!(aio_ex->inbuf = SMB_MALLOC_ARRAY(char, inbuflen))) {
101 SAFE_FREE(aio_ex->outbuf);
102 SAFE_FREE(aio_ex);
103 return NULL;
104 }
105
106 DLIST_ADD(aio_list_head, aio_ex);
107 aio_ex->fsp = fsp;
108 aio_ex->read_req = False;
109 aio_ex->mid = mid;
110 return aio_ex;
111}
112
113/****************************************************************************
114 Delete the extended aio struct.
115*****************************************************************************/
116
117static void delete_aio_ex(struct aio_extra *aio_ex)
118{
119 DLIST_REMOVE(aio_list_head, aio_ex);
120 SAFE_FREE(aio_ex->inbuf);
121 SAFE_FREE(aio_ex->outbuf);
122 SAFE_FREE(aio_ex);
123}
124
125/****************************************************************************
126 Given the aiocb struct find the extended aio struct containing it.
127*****************************************************************************/
128
129static struct aio_extra *find_aio_ex(uint16 mid)
130{
131 struct aio_extra *p;
132
133 for( p = aio_list_head; p; p = p->next) {
134 if (mid == p->mid) {
135 return p;
136 }
137 }
138 return NULL;
139}
140
141/****************************************************************************
142 We can have these many aio buffers in flight.
143*****************************************************************************/
144
145#define AIO_PENDING_SIZE 10
146static sig_atomic_t signals_received;
147static int outstanding_aio_calls;
148static uint16 aio_pending_array[AIO_PENDING_SIZE];
149
150/****************************************************************************
151 Signal handler when an aio request completes.
152*****************************************************************************/
153
154static void signal_handler(int sig, siginfo_t *info, void *unused)
155{
156 if (signals_received < AIO_PENDING_SIZE) {
157 aio_pending_array[signals_received] = info->si_value.sival_int;
158 signals_received++;
159 } /* Else signal is lost. */
160 sys_select_signal(RT_SIGNAL_AIO);
161}
162
163/****************************************************************************
164 Is there a signal waiting ?
165*****************************************************************************/
166
167BOOL aio_finished(void)
168{
169 return (signals_received != 0);
170}
171
172/****************************************************************************
173 Initialize the signal handler for aio read/write.
174*****************************************************************************/
175
176void initialize_async_io_handler(void)
177{
178 struct sigaction act;
179
180 ZERO_STRUCT(act);
181 act.sa_sigaction = signal_handler;
182 act.sa_flags = SA_SIGINFO;
183 sigemptyset( &act.sa_mask );
184 if (sigaction(RT_SIGNAL_AIO, &act, NULL) != 0) {
185 DEBUG(0,("Failed to setup RT_SIGNAL_AIO handler\n"));
186 }
187
188 /* the signal can start off blocked due to a bug in bash */
189 BlockSignals(False, RT_SIGNAL_AIO);
190}
191
192/****************************************************************************
193 Set up an aio request from a SMBreadX call.
194*****************************************************************************/
195
196BOOL schedule_aio_read_and_X(connection_struct *conn,
197 char *inbuf, char *outbuf,
198 int length, int len_outbuf,
199 files_struct *fsp, SMB_OFF_T startpos,
200 size_t smb_maxcnt)
201{
202 struct aio_extra *aio_ex;
203 SMB_STRUCT_AIOCB *a;
204 size_t bufsize;
205 size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
206
207 if (!min_aio_read_size || (smb_maxcnt < min_aio_read_size)) {
208 /* Too small a read for aio request. */
209 DEBUG(10,("schedule_aio_read_and_X: read size (%u) too small "
210 "for minimum aio_read of %u\n",
211 (unsigned int)smb_maxcnt,
212 (unsigned int)min_aio_read_size ));
213 return False;
214 }
215
216 /* Only do this on non-chained and non-chaining reads not using the
217 * write cache. */
218 if (chain_size !=0 || (CVAL(inbuf,smb_vwv0) != 0xFF)
219 || (lp_write_cache_size(SNUM(conn)) != 0) ) {
220 return False;
221 }
222
223 if (outstanding_aio_calls >= AIO_PENDING_SIZE) {
224 DEBUG(10,("schedule_aio_read_and_X: Already have %d aio "
225 "activities outstanding.\n",
226 outstanding_aio_calls ));
227 return False;
228 }
229
230 /* The following is safe from integer wrap as we've already
231 checked smb_maxcnt is 128k or less. */
232 bufsize = PTR_DIFF(smb_buf(outbuf),outbuf) + smb_maxcnt;
233
234 if ((aio_ex = create_aio_ex_read(fsp, bufsize,
235 SVAL(inbuf,smb_mid))) == NULL) {
236 DEBUG(10,("schedule_aio_read_and_X: malloc fail.\n"));
237 return False;
238 }
239
240 /* Copy the SMB header already setup in outbuf. */
241 memcpy(aio_ex->outbuf, outbuf, smb_buf(outbuf) - outbuf);
242 SCVAL(aio_ex->outbuf,smb_vwv0,0xFF); /* Never a chained reply. */
243
244 a = &aio_ex->acb;
245
246 /* Now set up the aio record for the read call. */
247
248 a->aio_fildes = fsp->fh->fd;
249 a->aio_buf = smb_buf(aio_ex->outbuf);
250 a->aio_nbytes = smb_maxcnt;
251 a->aio_offset = startpos;
252 a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
253 a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
254 a->aio_sigevent.sigev_value.sival_int = aio_ex->mid;
255
[165]256 become_root();
[44]257 if (SMB_VFS_AIO_READ(fsp,a) == -1) {
258 DEBUG(0,("schedule_aio_read_and_X: aio_read failed. "
259 "Error %s\n", strerror(errno) ));
260 delete_aio_ex(aio_ex);
[165]261 unbecome_root();
[44]262 return False;
263 }
[165]264 unbecome_root();
[44]265
266 DEBUG(10,("schedule_aio_read_and_X: scheduled aio_read for file %s, "
267 "offset %.0f, len = %u (mid = %u)\n",
268 fsp->fsp_name, (double)startpos, (unsigned int)smb_maxcnt,
269 (unsigned int)aio_ex->mid ));
270
271 srv_defer_sign_response(aio_ex->mid);
272 outstanding_aio_calls++;
273 return True;
274}
275
276/****************************************************************************
277 Set up an aio request from a SMBwriteX call.
278*****************************************************************************/
279
280BOOL schedule_aio_write_and_X(connection_struct *conn,
281 char *inbuf, char *outbuf,
282 int length, int len_outbuf,
283 files_struct *fsp, char *data,
284 SMB_OFF_T startpos,
285 size_t numtowrite)
286{
287 struct aio_extra *aio_ex;
288 SMB_STRUCT_AIOCB *a;
289 size_t inbufsize, outbufsize;
290 BOOL write_through = BITSETW(inbuf+smb_vwv7,0);
291 size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
292
293 if (!min_aio_write_size || (numtowrite < min_aio_write_size)) {
294 /* Too small a write for aio request. */
295 DEBUG(10,("schedule_aio_write_and_X: write size (%u) too "
296 "small for minimum aio_write of %u\n",
297 (unsigned int)numtowrite,
298 (unsigned int)min_aio_write_size ));
299 return False;
300 }
301
302 /* Only do this on non-chained and non-chaining reads not using the
303 * write cache. */
304 if (chain_size !=0 || (CVAL(inbuf,smb_vwv0) != 0xFF)
305 || (lp_write_cache_size(SNUM(conn)) != 0) ) {
306 return False;
307 }
308
309 if (outstanding_aio_calls >= AIO_PENDING_SIZE) {
310 DEBUG(3,("schedule_aio_write_and_X: Already have %d aio "
311 "activities outstanding.\n",
312 outstanding_aio_calls ));
313 DEBUG(10,("schedule_aio_write_and_X: failed to schedule "
314 "aio_write for file %s, offset %.0f, len = %u "
315 "(mid = %u)\n",
316 fsp->fsp_name, (double)startpos,
317 (unsigned int)numtowrite,
318 (unsigned int)SVAL(inbuf,smb_mid) ));
319 return False;
320 }
321
322 inbufsize = smb_len(inbuf) + 4;
323 outbufsize = smb_len(outbuf) + 4;
324 if (!(aio_ex = create_aio_ex_write(fsp, inbufsize, outbufsize,
325 SVAL(inbuf,smb_mid)))) {
326 DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n"));
327 return False;
328 }
329
330 /* Copy the SMB header already setup in outbuf. */
331 memcpy(aio_ex->inbuf, inbuf, inbufsize);
332
333 /* Copy the SMB header already setup in outbuf. */
334 memcpy(aio_ex->outbuf, outbuf, outbufsize);
335 SCVAL(aio_ex->outbuf,smb_vwv0,0xFF); /* Never a chained reply. */
336
337 a = &aio_ex->acb;
338
339 /* Now set up the aio record for the write call. */
340
341 a->aio_fildes = fsp->fh->fd;
342 a->aio_buf = aio_ex->inbuf + (PTR_DIFF(data, inbuf));
343 a->aio_nbytes = numtowrite;
344 a->aio_offset = startpos;
345 a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
346 a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
347 a->aio_sigevent.sigev_value.sival_int = aio_ex->mid;
348
[165]349 become_root();
[44]350 if (SMB_VFS_AIO_WRITE(fsp,a) == -1) {
351 DEBUG(3,("schedule_aio_wrote_and_X: aio_write failed. "
352 "Error %s\n", strerror(errno) ));
353 delete_aio_ex(aio_ex);
[165]354 unbecome_root();
[44]355 return False;
356 }
[165]357 unbecome_root();
[44]358
359 if (!write_through && !lp_syncalways(SNUM(fsp->conn))
360 && fsp->aio_write_behind) {
361 /* Lie to the client and immediately claim we finished the
362 * write. */
363 SSVAL(aio_ex->outbuf,smb_vwv2,numtowrite);
364 SSVAL(aio_ex->outbuf,smb_vwv4,(numtowrite>>16)&1);
365 show_msg(aio_ex->outbuf);
366 if (!send_smb(smbd_server_fd(),aio_ex->outbuf)) {
367 exit_server_cleanly("handle_aio_write: send_smb "
368 "failed.");
369 }
370 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write "
371 "behind for file %s\n", fsp->fsp_name ));
372 } else {
373 srv_defer_sign_response(aio_ex->mid);
374 }
375 outstanding_aio_calls++;
376
377 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write for file "
378 "%s, offset %.0f, len = %u (mid = %u) "
379 "outstanding_aio_calls = %d\n",
380 fsp->fsp_name, (double)startpos, (unsigned int)numtowrite,
381 (unsigned int)aio_ex->mid, outstanding_aio_calls ));
382
383 return True;
384}
385
386
387/****************************************************************************
388 Complete the read and return the data or error back to the client.
389 Returns errno or zero if all ok.
390*****************************************************************************/
391
392static int handle_aio_read_complete(struct aio_extra *aio_ex)
393{
394 int ret = 0;
395 int outsize;
396 char *outbuf = aio_ex->outbuf;
397 char *data = smb_buf(outbuf);
398 ssize_t nread = SMB_VFS_AIO_RETURN(aio_ex->fsp,&aio_ex->acb);
399
400 if (nread < 0) {
401 /* We're relying here on the fact that if the fd is
402 closed then the aio will complete and aio_return
403 will return an error. Hopefully this is
404 true.... JRA. */
405
406 /* If errno is ECANCELED then don't return anything to the
407 * client. */
408 if (errno == ECANCELED) {
409 srv_cancel_sign_response(aio_ex->mid);
410 return 0;
411 }
412
413 DEBUG( 3,( "handle_aio_read_complete: file %s nread == -1. "
414 "Error = %s\n",
415 aio_ex->fsp->fsp_name, strerror(errno) ));
416
417 outsize = (UNIXERROR(ERRDOS,ERRnoaccess));
418 ret = errno;
419 } else {
420 outsize = set_message(outbuf,12,nread,False);
421 SSVAL(outbuf,smb_vwv2,0xFFFF); /* Remaining - must be * -1. */
422 SSVAL(outbuf,smb_vwv5,nread);
423 SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf));
424 SSVAL(outbuf,smb_vwv7,((nread >> 16) & 1));
425 SSVAL(smb_buf(outbuf),-2,nread);
426
427 DEBUG( 3, ( "handle_aio_read_complete file %s max=%d "
428 "nread=%d\n",
429 aio_ex->fsp->fsp_name,
430 aio_ex->acb.aio_nbytes, (int)nread ) );
431
432 }
433 smb_setlen(outbuf,outsize - 4);
434 show_msg(outbuf);
435 if (!send_smb(smbd_server_fd(),outbuf)) {
436 exit_server_cleanly("handle_aio_read_complete: send_smb "
437 "failed.");
438 }
439
440 DEBUG(10,("handle_aio_read_complete: scheduled aio_read completed "
441 "for file %s, offset %.0f, len = %u\n",
442 aio_ex->fsp->fsp_name, (double)aio_ex->acb.aio_offset,
443 (unsigned int)nread ));
444
445 return ret;
446}
447
448/****************************************************************************
449 Complete the write and return the data or error back to the client.
450 Returns errno or zero if all ok.
451*****************************************************************************/
452
453static int handle_aio_write_complete(struct aio_extra *aio_ex)
454{
455 int ret = 0;
456 files_struct *fsp = aio_ex->fsp;
457 char *outbuf = aio_ex->outbuf;
458 ssize_t numtowrite = aio_ex->acb.aio_nbytes;
459 ssize_t nwritten = SMB_VFS_AIO_RETURN(fsp,&aio_ex->acb);
460
461 if (fsp->aio_write_behind) {
462 if (nwritten != numtowrite) {
463 if (nwritten == -1) {
464 DEBUG(5,("handle_aio_write_complete: "
465 "aio_write_behind failed ! File %s "
466 "is corrupt ! Error %s\n",
467 fsp->fsp_name, strerror(errno) ));
468 ret = errno;
469 } else {
470 DEBUG(0,("handle_aio_write_complete: "
471 "aio_write_behind failed ! File %s "
472 "is corrupt ! Wanted %u bytes but "
473 "only wrote %d\n", fsp->fsp_name,
474 (unsigned int)numtowrite,
475 (int)nwritten ));
476 ret = EIO;
477 }
478 } else {
479 DEBUG(10,("handle_aio_write_complete: "
480 "aio_write_behind completed for file %s\n",
481 fsp->fsp_name ));
482 }
483 return 0;
484 }
485
486 /* We don't need outsize or set_message here as we've already set the
487 fixed size length when we set up the aio call. */
488
489 if(nwritten == -1) {
490 DEBUG( 3,( "handle_aio_write: file %s wanted %u bytes. "
491 "nwritten == %d. Error = %s\n",
492 fsp->fsp_name, (unsigned int)numtowrite,
493 (int)nwritten, strerror(errno) ));
494
495 /* If errno is ECANCELED then don't return anything to the
496 * client. */
497 if (errno == ECANCELED) {
498 srv_cancel_sign_response(aio_ex->mid);
499 return 0;
500 }
501
502 UNIXERROR(ERRHRD,ERRdiskfull);
503 ret = errno;
504 } else {
505 BOOL write_through = BITSETW(aio_ex->inbuf+smb_vwv7,0);
506 NTSTATUS status;
507
508 SSVAL(outbuf,smb_vwv2,nwritten);
509 SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1);
510 if (nwritten < (ssize_t)numtowrite) {
511 SCVAL(outbuf,smb_rcls,ERRHRD);
512 SSVAL(outbuf,smb_err,ERRdiskfull);
513 }
514
515 DEBUG(3,("handle_aio_write: fnum=%d num=%d wrote=%d\n",
516 fsp->fnum, (int)numtowrite, (int)nwritten));
517 status = sync_file(fsp->conn,fsp, write_through);
518 if (!NT_STATUS_IS_OK(status)) {
519 UNIXERROR(ERRHRD,ERRdiskfull);
520 ret = errno;
521 DEBUG(5,("handle_aio_write: sync_file for %s returned %s\n",
522 fsp->fsp_name, nt_errstr(status) ));
523 }
524 }
525
526 show_msg(outbuf);
527 if (!send_smb(smbd_server_fd(),outbuf)) {
528 exit_server_cleanly("handle_aio_write: send_smb failed.");
529 }
530
531 DEBUG(10,("handle_aio_write_complete: scheduled aio_write completed "
532 "for file %s, offset %.0f, requested %u, written = %u\n",
533 fsp->fsp_name, (double)aio_ex->acb.aio_offset,
534 (unsigned int)numtowrite, (unsigned int)nwritten ));
535
536 return ret;
537}
538
539/****************************************************************************
540 Handle any aio completion. Returns True if finished (and sets *perr if err
541 was non-zero), False if not.
542*****************************************************************************/
543
544static BOOL handle_aio_completed(struct aio_extra *aio_ex, int *perr)
545{
546 int err;
547
548 /* Ensure the operation has really completed. */
549 if (SMB_VFS_AIO_ERROR(aio_ex->fsp, &aio_ex->acb) == EINPROGRESS) {
550 DEBUG(10,( "handle_aio_completed: operation mid %u still in "
551 "process for file %s\n",
552 aio_ex->mid, aio_ex->fsp->fsp_name ));
553 return False;
554 }
555
556 if (aio_ex->read_req) {
557 err = handle_aio_read_complete(aio_ex);
558 } else {
559 err = handle_aio_write_complete(aio_ex);
560 }
561
562 if (err) {
563 *perr = err; /* Only save non-zero errors. */
564 }
565
566 return True;
567}
568
569/****************************************************************************
570 Handle any aio completion inline.
571 Returns non-zero errno if fail or zero if all ok.
572*****************************************************************************/
573
574int process_aio_queue(void)
575{
576 int i;
577 int ret = 0;
578
579 BlockSignals(True, RT_SIGNAL_AIO);
580
581 DEBUG(10,("process_aio_queue: signals_received = %d\n",
582 (int)signals_received));
583 DEBUG(10,("process_aio_queue: outstanding_aio_calls = %d\n",
584 outstanding_aio_calls));
585
586 if (!signals_received) {
587 BlockSignals(False, RT_SIGNAL_AIO);
588 return 0;
589 }
590
591 /* Drain all the complete aio_reads. */
592 for (i = 0; i < signals_received; i++) {
593 uint16 mid = aio_pending_array[i];
594 files_struct *fsp = NULL;
595 struct aio_extra *aio_ex = find_aio_ex(mid);
596
597 if (!aio_ex) {
598 DEBUG(3,("process_aio_queue: Can't find record to "
599 "match mid %u.\n", (unsigned int)mid));
600 srv_cancel_sign_response(mid);
601 continue;
602 }
603
604 fsp = aio_ex->fsp;
605 if (fsp == NULL) {
606 /* file was closed whilst I/O was outstanding. Just
607 * ignore. */
608 DEBUG( 3,( "process_aio_queue: file closed whilst "
609 "aio outstanding.\n"));
610 srv_cancel_sign_response(mid);
611 continue;
612 }
613
614 if (!handle_aio_completed(aio_ex, &ret)) {
615 continue;
616 }
617
618 delete_aio_ex(aio_ex);
619 }
620
621 outstanding_aio_calls -= signals_received;
622 signals_received = 0;
623 BlockSignals(False, RT_SIGNAL_AIO);
624 return ret;
625}
626
627/****************************************************************************
628 We're doing write behind and the client closed the file. Wait up to 30
629 seconds (my arbitrary choice) for the aio to complete. Return 0 if all writes
630 completed, errno to return if not.
631*****************************************************************************/
632
633#define SMB_TIME_FOR_AIO_COMPLETE_WAIT 29
634
635int wait_for_aio_completion(files_struct *fsp)
636{
637 struct aio_extra *aio_ex;
638 const SMB_STRUCT_AIOCB **aiocb_list;
639 int aio_completion_count = 0;
640 time_t start_time = time(NULL);
641 int seconds_left;
642
643 for (seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT;
644 seconds_left >= 0;) {
645 int err = 0;
646 int i;
647 struct timespec ts;
648
649 aio_completion_count = 0;
650 for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) {
651 if (aio_ex->fsp == fsp) {
652 aio_completion_count++;
653 }
654 }
655
656 if (!aio_completion_count) {
657 return 0;
658 }
659
660 DEBUG(3,("wait_for_aio_completion: waiting for %d aio events "
661 "to complete.\n", aio_completion_count ));
662
663 aiocb_list = SMB_MALLOC_ARRAY(const SMB_STRUCT_AIOCB *,
664 aio_completion_count);
665 if (!aiocb_list) {
666 return ENOMEM;
667 }
668
669 for( i = 0, aio_ex = aio_list_head;
670 aio_ex;
671 aio_ex = aio_ex->next) {
672 if (aio_ex->fsp == fsp) {
673 aiocb_list[i++] = &aio_ex->acb;
674 }
675 }
676
677 /* Now wait up to seconds_left for completion. */
678 ts.tv_sec = seconds_left;
679 ts.tv_nsec = 0;
680
681 DEBUG(10,("wait_for_aio_completion: %d events, doing a wait "
682 "of %d seconds.\n",
683 aio_completion_count, seconds_left ));
684
685 err = SMB_VFS_AIO_SUSPEND(fsp, aiocb_list,
686 aio_completion_count, &ts);
687
688 DEBUG(10,("wait_for_aio_completion: returned err = %d, "
689 "errno = %s\n", err, strerror(errno) ));
690
691 if (err == -1 && errno == EAGAIN) {
692 DEBUG(0,("wait_for_aio_completion: aio_suspend timed "
693 "out waiting for %d events after a wait of "
694 "%d seconds\n", aio_completion_count,
695 seconds_left));
696 /* Timeout. */
697 cancel_aio_by_fsp(fsp);
698 SAFE_FREE(aiocb_list);
699 return EIO;
700 }
701
702 /* One or more events might have completed - process them if
703 * so. */
704 for( i = 0; i < aio_completion_count; i++) {
705 uint16 mid = aiocb_list[i]->aio_sigevent.sigev_value.sival_int;
706
707 aio_ex = find_aio_ex(mid);
708
709 if (!aio_ex) {
710 DEBUG(0, ("wait_for_aio_completion: mid %u "
711 "doesn't match an aio record\n",
712 (unsigned int)mid ));
713 continue;
714 }
715
716 if (!handle_aio_completed(aio_ex, &err)) {
717 continue;
718 }
719 delete_aio_ex(aio_ex);
720 }
721
722 SAFE_FREE(aiocb_list);
723 seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT
724 - (time(NULL) - start_time);
725 }
726
727 /* We timed out - we don't know why. Return ret if already an error,
728 * else EIO. */
729 DEBUG(10,("wait_for_aio_completion: aio_suspend timed out waiting "
730 "for %d events\n",
731 aio_completion_count));
732
733 return EIO;
734}
735
736/****************************************************************************
737 Cancel any outstanding aio requests. The client doesn't care about the reply.
738*****************************************************************************/
739
740void cancel_aio_by_fsp(files_struct *fsp)
741{
742 struct aio_extra *aio_ex;
743
744 for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) {
745 if (aio_ex->fsp == fsp) {
746 /* Don't delete the aio_extra record as we may have
747 completed and don't yet know it. Just do the
748 aio_cancel call and return. */
749 SMB_VFS_AIO_CANCEL(fsp,fsp->fh->fd, &aio_ex->acb);
750 aio_ex->fsp = NULL; /* fsp will be closed when we
751 * return. */
752 }
753 }
754}
755
756#else
757BOOL aio_finished(void)
758{
759 return False;
760}
761
762void initialize_async_io_handler(void)
763{
764}
765
766int process_aio_queue(void)
767{
768 return False;
769}
770
771BOOL schedule_aio_read_and_X(connection_struct *conn,
772 char *inbuf, char *outbuf,
773 int length, int len_outbuf,
774 files_struct *fsp, SMB_OFF_T startpos,
775 size_t smb_maxcnt)
776{
777 return False;
778}
779
780BOOL schedule_aio_write_and_X(connection_struct *conn,
781 char *inbuf, char *outbuf,
782 int length, int len_outbuf,
783 files_struct *fsp, char *data,
784 SMB_OFF_T startpos,
785 size_t numtowrite)
786{
787 return False;
788}
789
790void cancel_aio_by_fsp(files_struct *fsp)
791{
792}
793
794BOOL wait_for_aio_completion(files_struct *fsp)
795{
796 return True;
797}
798#endif
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