/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- aio_extra_destructor
- create_aio_extra
- find_aio_ex
- schedule_aio_read_and_X
- schedule_aio_write_and_X
- handle_aio_read_complete
- handle_aio_write_complete
- handle_aio_completed
- smbd_aio_complete_mid
- smbd_aio_signal_handler
- wait_for_aio_completion
- cancel_aio_by_fsp
- initialize_async_io_handler
- initialize_async_io_handler
- schedule_aio_read_and_X
- schedule_aio_write_and_X
- cancel_aio_by_fsp
- wait_for_aio_completion
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 #ifndef SIGRTMIN
29 #define SIGRTMIN NSIG
30 #endif
31 #define RT_SIGNAL_AIO (SIGRTMIN+3)
32 #endif
33
34 #ifndef HAVE_STRUCT_SIGEVENT_SIGEV_VALUE_SIVAL_PTR
35 #ifdef HAVE_STRUCT_SIGEVENT_SIGEV_VALUE_SIGVAL_PTR
36 #define sival_int sigval_int
37 #define sival_ptr sigval_ptr
38 #endif
39 #endif
40
41 /****************************************************************************
42 The buffer we keep around whilst an aio request is in process.
43 *****************************************************************************/
44
45 struct aio_extra {
46 struct aio_extra *next, *prev;
47 SMB_STRUCT_AIOCB acb;
48 files_struct *fsp;
49 struct smb_request *req;
50 char *outbuf;
51 int (*handle_completion)(struct aio_extra *ex, int errcode);
52 };
53
54 static int handle_aio_read_complete(struct aio_extra *aio_ex, int errcode);
55 static int handle_aio_write_complete(struct aio_extra *aio_ex, int errcode);
56
57 static int aio_extra_destructor(struct aio_extra *aio_ex)
/* [<][>][^][v][top][bottom][index][help] */
58 {
59 DLIST_REMOVE(aio_list_head, aio_ex);
60 return 0;
61 }
62
63 /****************************************************************************
64 Create the extended aio struct we must keep around for the lifetime
65 of the aio call.
66 *****************************************************************************/
67
68 static struct aio_extra *create_aio_extra(files_struct *fsp, size_t buflen)
/* [<][>][^][v][top][bottom][index][help] */
69 {
70 struct aio_extra *aio_ex = TALLOC_ZERO_P(NULL, struct aio_extra);
71
72 if (!aio_ex) {
73 return NULL;
74 }
75
76 /* The output buffer stored in the aio_ex is the start of
77 the smb return buffer. The buffer used in the acb
78 is the start of the reply data portion of that buffer. */
79
80 aio_ex->outbuf = TALLOC_ARRAY(aio_ex, char, buflen);
81 if (!aio_ex->outbuf) {
82 TALLOC_FREE(aio_ex);
83 return NULL;
84 }
85 DLIST_ADD(aio_list_head, aio_ex);
86 talloc_set_destructor(aio_ex, aio_extra_destructor);
87 aio_ex->fsp = fsp;
88 return aio_ex;
89 }
90
91 /****************************************************************************
92 Given the mid find the extended aio struct containing it.
93 *****************************************************************************/
94
95 static struct aio_extra *find_aio_ex(uint16 mid)
/* [<][>][^][v][top][bottom][index][help] */
96 {
97 struct aio_extra *p;
98
99 for( p = aio_list_head; p; p = p->next) {
100 if (mid == p->req->mid) {
101 return p;
102 }
103 }
104 return NULL;
105 }
106
107 /****************************************************************************
108 We can have these many aio buffers in flight.
109 *****************************************************************************/
110
111 /****************************************************************************
112 Set up an aio request from a SMBreadX call.
113 *****************************************************************************/
114
115 bool schedule_aio_read_and_X(connection_struct *conn,
/* [<][>][^][v][top][bottom][index][help] */
116 struct smb_request *req,
117 files_struct *fsp, SMB_OFF_T startpos,
118 size_t smb_maxcnt)
119 {
120 struct aio_extra *aio_ex;
121 SMB_STRUCT_AIOCB *a;
122 size_t bufsize;
123 size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
124 int ret;
125
126 if (fsp->base_fsp != NULL) {
127 /* No AIO on streams yet */
128 DEBUG(10, ("AIO on streams not yet supported\n"));
129 return false;
130 }
131
132 if ((!min_aio_read_size || (smb_maxcnt < min_aio_read_size))
133 && !SMB_VFS_AIO_FORCE(fsp)) {
134 /* Too small a read for aio request. */
135 DEBUG(10,("schedule_aio_read_and_X: read size (%u) too small "
136 "for minimum aio_read of %u\n",
137 (unsigned int)smb_maxcnt,
138 (unsigned int)min_aio_read_size ));
139 return False;
140 }
141
142 /* Only do this on non-chained and non-chaining reads not using the
143 * write cache. */
144 if (req_is_in_chain(req) || (lp_write_cache_size(SNUM(conn)) != 0)) {
145 return False;
146 }
147
148 if (outstanding_aio_calls >= aio_pending_size) {
149 DEBUG(10,("schedule_aio_read_and_X: Already have %d aio "
150 "activities outstanding.\n",
151 outstanding_aio_calls ));
152 return False;
153 }
154
155 /* The following is safe from integer wrap as we've already checked
156 smb_maxcnt is 128k or less. Wct is 12 for read replies */
157
158 bufsize = smb_size + 12 * 2 + smb_maxcnt;
159
160 if ((aio_ex = create_aio_extra(fsp, bufsize)) == NULL) {
161 DEBUG(10,("schedule_aio_read_and_X: malloc fail.\n"));
162 return False;
163 }
164 aio_ex->handle_completion = handle_aio_read_complete;
165
166 construct_reply_common_req(req, aio_ex->outbuf);
167 srv_set_message(aio_ex->outbuf, 12, 0, True);
168 SCVAL(aio_ex->outbuf,smb_vwv0,0xFF); /* Never a chained reply. */
169
170 a = &aio_ex->acb;
171
172 /* Now set up the aio record for the read call. */
173
174 a->aio_fildes = fsp->fh->fd;
175 a->aio_buf = smb_buf(aio_ex->outbuf);
176 a->aio_nbytes = smb_maxcnt;
177 a->aio_offset = startpos;
178 a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
179 a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
180 a->aio_sigevent.sigev_value.sival_int = req->mid;
181
182 ret = SMB_VFS_AIO_READ(fsp, a);
183 if (ret == -1) {
184 DEBUG(0,("schedule_aio_read_and_X: aio_read failed. "
185 "Error %s\n", strerror(errno) ));
186 TALLOC_FREE(aio_ex);
187 return False;
188 }
189
190 outstanding_aio_calls++;
191 aio_ex->req = talloc_move(aio_ex, &req);
192
193 DEBUG(10,("schedule_aio_read_and_X: scheduled aio_read for file %s, "
194 "offset %.0f, len = %u (mid = %u)\n",
195 fsp->fsp_name, (double)startpos, (unsigned int)smb_maxcnt,
196 (unsigned int)aio_ex->req->mid ));
197
198 srv_defer_sign_response(aio_ex->req->mid);
199 return True;
200 }
201
202 /****************************************************************************
203 Set up an aio request from a SMBwriteX call.
204 *****************************************************************************/
205
206 bool schedule_aio_write_and_X(connection_struct *conn,
/* [<][>][^][v][top][bottom][index][help] */
207 struct smb_request *req,
208 files_struct *fsp, char *data,
209 SMB_OFF_T startpos,
210 size_t numtowrite)
211 {
212 struct aio_extra *aio_ex;
213 SMB_STRUCT_AIOCB *a;
214 size_t bufsize;
215 bool write_through = BITSETW(req->vwv+7,0);
216 size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
217 int ret;
218
219 if (fsp->base_fsp != NULL) {
220 /* No AIO on streams yet */
221 DEBUG(10, ("AIO on streams not yet supported\n"));
222 return false;
223 }
224
225 if ((!min_aio_write_size || (numtowrite < min_aio_write_size))
226 && !SMB_VFS_AIO_FORCE(fsp)) {
227 /* Too small a write for aio request. */
228 DEBUG(10,("schedule_aio_write_and_X: write size (%u) too "
229 "small for minimum aio_write of %u\n",
230 (unsigned int)numtowrite,
231 (unsigned int)min_aio_write_size ));
232 return False;
233 }
234
235 /* Only do this on non-chained and non-chaining reads not using the
236 * write cache. */
237 if (req_is_in_chain(req) || (lp_write_cache_size(SNUM(conn)) != 0)) {
238 return False;
239 }
240
241 if (outstanding_aio_calls >= aio_pending_size) {
242 DEBUG(3,("schedule_aio_write_and_X: Already have %d aio "
243 "activities outstanding.\n",
244 outstanding_aio_calls ));
245 DEBUG(10,("schedule_aio_write_and_X: failed to schedule "
246 "aio_write for file %s, offset %.0f, len = %u "
247 "(mid = %u)\n",
248 fsp->fsp_name, (double)startpos,
249 (unsigned int)numtowrite,
250 (unsigned int)req->mid ));
251 return False;
252 }
253
254 bufsize = smb_size + 6*2;
255
256 if (!(aio_ex = create_aio_extra(fsp, bufsize))) {
257 DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n"));
258 return False;
259 }
260 aio_ex->handle_completion = handle_aio_write_complete;
261
262 construct_reply_common_req(req, aio_ex->outbuf);
263 srv_set_message(aio_ex->outbuf, 6, 0, True);
264 SCVAL(aio_ex->outbuf,smb_vwv0,0xFF); /* Never a chained reply. */
265
266 a = &aio_ex->acb;
267
268 /* Now set up the aio record for the write call. */
269
270 a->aio_fildes = fsp->fh->fd;
271 a->aio_buf = data;
272 a->aio_nbytes = numtowrite;
273 a->aio_offset = startpos;
274 a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
275 a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
276 a->aio_sigevent.sigev_value.sival_int = req->mid;
277
278 ret = SMB_VFS_AIO_WRITE(fsp, a);
279 if (ret == -1) {
280 DEBUG(3,("schedule_aio_wrote_and_X: aio_write failed. "
281 "Error %s\n", strerror(errno) ));
282 TALLOC_FREE(aio_ex);
283 return False;
284 }
285
286 outstanding_aio_calls++;
287 aio_ex->req = talloc_move(aio_ex, &req);
288
289 /* This should actually be improved to span the write. */
290 contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
291 contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
292
293 if (!write_through && !lp_syncalways(SNUM(fsp->conn))
294 && fsp->aio_write_behind) {
295 /* Lie to the client and immediately claim we finished the
296 * write. */
297 SSVAL(aio_ex->outbuf,smb_vwv2,numtowrite);
298 SSVAL(aio_ex->outbuf,smb_vwv4,(numtowrite>>16)&1);
299 show_msg(aio_ex->outbuf);
300 if (!srv_send_smb(smbd_server_fd(),aio_ex->outbuf,
301 IS_CONN_ENCRYPTED(fsp->conn),
302 &aio_ex->req->pcd)) {
303 exit_server_cleanly("handle_aio_write: srv_send_smb "
304 "failed.");
305 }
306 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write "
307 "behind for file %s\n", fsp->fsp_name ));
308 } else {
309 srv_defer_sign_response(aio_ex->req->mid);
310 }
311
312 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write for file "
313 "%s, offset %.0f, len = %u (mid = %u) "
314 "outstanding_aio_calls = %d\n",
315 fsp->fsp_name, (double)startpos, (unsigned int)numtowrite,
316 (unsigned int)aio_ex->req->mid, outstanding_aio_calls ));
317
318 return True;
319 }
320
321
322 /****************************************************************************
323 Complete the read and return the data or error back to the client.
324 Returns errno or zero if all ok.
325 *****************************************************************************/
326
327 static int handle_aio_read_complete(struct aio_extra *aio_ex, int errcode)
/* [<][>][^][v][top][bottom][index][help] */
328 {
329 int ret = 0;
330 int outsize;
331 char *outbuf = aio_ex->outbuf;
332 char *data = smb_buf(outbuf);
333 ssize_t nread = SMB_VFS_AIO_RETURN(aio_ex->fsp,&aio_ex->acb);
334
335 if (nread < 0) {
336 /* We're relying here on the fact that if the fd is
337 closed then the aio will complete and aio_return
338 will return an error. Hopefully this is
339 true.... JRA. */
340
341 DEBUG( 3,( "handle_aio_read_complete: file %s nread == %d "
342 "Error = %s\n",
343 aio_ex->fsp->fsp_name, (int)nread, strerror(errcode) ));
344
345 ret = errcode;
346 ERROR_NT(map_nt_error_from_unix( ret));
347 outsize = srv_set_message(outbuf,0,0,true);
348 } else {
349 outsize = srv_set_message(outbuf,12,nread,False);
350 SSVAL(outbuf,smb_vwv2,0xFFFF); /* Remaining - must be * -1. */
351 SSVAL(outbuf,smb_vwv5,nread);
352 SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf));
353 SSVAL(outbuf,smb_vwv7,((nread >> 16) & 1));
354 SSVAL(smb_buf(outbuf),-2,nread);
355
356 aio_ex->fsp->fh->pos = aio_ex->acb.aio_offset + nread;
357 aio_ex->fsp->fh->position_information = aio_ex->fsp->fh->pos;
358
359 DEBUG( 3, ( "handle_aio_read_complete file %s max=%d "
360 "nread=%d\n",
361 aio_ex->fsp->fsp_name,
362 (int)aio_ex->acb.aio_nbytes, (int)nread ) );
363
364 }
365 smb_setlen(outbuf,outsize - 4);
366 show_msg(outbuf);
367 if (!srv_send_smb(smbd_server_fd(),outbuf,
368 IS_CONN_ENCRYPTED(aio_ex->fsp->conn), NULL)) {
369 exit_server_cleanly("handle_aio_read_complete: srv_send_smb "
370 "failed.");
371 }
372
373 DEBUG(10,("handle_aio_read_complete: scheduled aio_read completed "
374 "for file %s, offset %.0f, len = %u\n",
375 aio_ex->fsp->fsp_name, (double)aio_ex->acb.aio_offset,
376 (unsigned int)nread ));
377
378 return ret;
379 }
380
381 /****************************************************************************
382 Complete the write and return the data or error back to the client.
383 Returns error code or zero if all ok.
384 *****************************************************************************/
385
386 static int handle_aio_write_complete(struct aio_extra *aio_ex, int errcode)
/* [<][>][^][v][top][bottom][index][help] */
387 {
388 int ret = 0;
389 files_struct *fsp = aio_ex->fsp;
390 char *outbuf = aio_ex->outbuf;
391 ssize_t numtowrite = aio_ex->acb.aio_nbytes;
392 ssize_t nwritten = SMB_VFS_AIO_RETURN(fsp,&aio_ex->acb);
393
394 if (fsp->aio_write_behind) {
395 if (nwritten != numtowrite) {
396 if (nwritten == -1) {
397 DEBUG(5,("handle_aio_write_complete: "
398 "aio_write_behind failed ! File %s "
399 "is corrupt ! Error %s\n",
400 fsp->fsp_name, strerror(errcode) ));
401 ret = errcode;
402 } else {
403 DEBUG(0,("handle_aio_write_complete: "
404 "aio_write_behind failed ! File %s "
405 "is corrupt ! Wanted %u bytes but "
406 "only wrote %d\n", fsp->fsp_name,
407 (unsigned int)numtowrite,
408 (int)nwritten ));
409 ret = EIO;
410 }
411 } else {
412 DEBUG(10,("handle_aio_write_complete: "
413 "aio_write_behind completed for file %s\n",
414 fsp->fsp_name ));
415 }
416 /* TODO: should no return 0 in case of an error !!! */
417 return 0;
418 }
419
420 /* We don't need outsize or set_message here as we've already set the
421 fixed size length when we set up the aio call. */
422
423 if(nwritten == -1) {
424 DEBUG( 3,( "handle_aio_write: file %s wanted %u bytes. "
425 "nwritten == %d. Error = %s\n",
426 fsp->fsp_name, (unsigned int)numtowrite,
427 (int)nwritten, strerror(errno) ));
428
429 ret = errcode;
430 ERROR_NT(map_nt_error_from_unix(ret));
431 srv_set_message(outbuf,0,0,true);
432 } else {
433 bool write_through = BITSETW(aio_ex->req->vwv+7,0);
434 NTSTATUS status;
435
436 SSVAL(outbuf,smb_vwv2,nwritten);
437 SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1);
438 if (nwritten < (ssize_t)numtowrite) {
439 SCVAL(outbuf,smb_rcls,ERRHRD);
440 SSVAL(outbuf,smb_err,ERRdiskfull);
441 }
442
443 DEBUG(3,("handle_aio_write: fnum=%d num=%d wrote=%d\n",
444 fsp->fnum, (int)numtowrite, (int)nwritten));
445 status = sync_file(fsp->conn,fsp, write_through);
446 if (!NT_STATUS_IS_OK(status)) {
447 ret = errno;
448 ERROR_BOTH(map_nt_error_from_unix(ret),
449 ERRHRD, ERRdiskfull);
450 srv_set_message(outbuf,0,0,true);
451 DEBUG(5,("handle_aio_write: sync_file for %s returned %s\n",
452 fsp->fsp_name, nt_errstr(status) ));
453 }
454
455 aio_ex->fsp->fh->pos = aio_ex->acb.aio_offset + nwritten;
456 }
457
458 show_msg(outbuf);
459 if (!srv_send_smb(smbd_server_fd(),outbuf,IS_CONN_ENCRYPTED(fsp->conn),
460 NULL)) {
461 exit_server_cleanly("handle_aio_write: srv_send_smb failed.");
462 }
463
464 DEBUG(10,("handle_aio_write_complete: scheduled aio_write completed "
465 "for file %s, offset %.0f, requested %u, written = %u\n",
466 fsp->fsp_name, (double)aio_ex->acb.aio_offset,
467 (unsigned int)numtowrite, (unsigned int)nwritten ));
468
469 return ret;
470 }
471
472 /****************************************************************************
473 Handle any aio completion. Returns True if finished (and sets *perr if err
474 was non-zero), False if not.
475 *****************************************************************************/
476
477 static bool handle_aio_completed(struct aio_extra *aio_ex, int *perr)
/* [<][>][^][v][top][bottom][index][help] */
478 {
479 int err;
480
481 if(!aio_ex) {
482 DEBUG(3, ("handle_aio_completed: Non-existing aio_ex passed\n"));
483 return false;
484 }
485
486 /* Ensure the operation has really completed. */
487 err = SMB_VFS_AIO_ERROR(aio_ex->fsp, &aio_ex->acb);
488 if (err == EINPROGRESS) {
489 DEBUG(10,( "handle_aio_completed: operation mid %u still in "
490 "process for file %s\n",
491 aio_ex->req->mid, aio_ex->fsp->fsp_name ));
492 return False;
493 } else if (err == ECANCELED) {
494 /* If error is ECANCELED then don't return anything to the
495 * client. */
496 DEBUG(10,( "handle_aio_completed: operation mid %u"
497 " canceled\n", aio_ex->req->mid));
498 srv_cancel_sign_response(aio_ex->req->mid, false);
499 return True;
500 }
501
502 err = aio_ex->handle_completion(aio_ex, err);
503 if (err) {
504 *perr = err; /* Only save non-zero errors. */
505 }
506
507 return True;
508 }
509
510 /****************************************************************************
511 Handle any aio completion inline.
512 *****************************************************************************/
513
514 void smbd_aio_complete_mid(unsigned int mid)
/* [<][>][^][v][top][bottom][index][help] */
515 {
516 files_struct *fsp = NULL;
517 struct aio_extra *aio_ex = find_aio_ex(mid);
518 int ret = 0;
519
520 outstanding_aio_calls--;
521
522 DEBUG(10,("smbd_aio_complete_mid: mid[%u]\n", mid));
523
524 if (!aio_ex) {
525 DEBUG(3,("smbd_aio_complete_mid: Can't find record to "
526 "match mid %u.\n", mid));
527 srv_cancel_sign_response(mid, false);
528 return;
529 }
530
531 fsp = aio_ex->fsp;
532 if (fsp == NULL) {
533 /* file was closed whilst I/O was outstanding. Just
534 * ignore. */
535 DEBUG( 3,( "smbd_aio_complete_mid: file closed whilst "
536 "aio outstanding (mid[%u]).\n", mid));
537 srv_cancel_sign_response(mid, false);
538 return;
539 }
540
541 if (!handle_aio_completed(aio_ex, &ret)) {
542 return;
543 }
544
545 TALLOC_FREE(aio_ex);
546 }
547
548 static void smbd_aio_signal_handler(struct tevent_context *ev_ctx,
/* [<][>][^][v][top][bottom][index][help] */
549 struct tevent_signal *se,
550 int signum, int count,
551 void *_info, void *private_data)
552 {
553 siginfo_t *info = (siginfo_t *)_info;
554 unsigned int mid = (unsigned int)info->si_value.sival_int;
555
556 smbd_aio_complete_mid(mid);
557 }
558
559 /****************************************************************************
560 We're doing write behind and the client closed the file. Wait up to 30
561 seconds (my arbitrary choice) for the aio to complete. Return 0 if all writes
562 completed, errno to return if not.
563 *****************************************************************************/
564
565 #define SMB_TIME_FOR_AIO_COMPLETE_WAIT 29
566
567 int wait_for_aio_completion(files_struct *fsp)
/* [<][>][^][v][top][bottom][index][help] */
568 {
569 struct aio_extra *aio_ex;
570 const SMB_STRUCT_AIOCB **aiocb_list;
571 int aio_completion_count = 0;
572 time_t start_time = time(NULL);
573 int seconds_left;
574
575 for (seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT;
576 seconds_left >= 0;) {
577 int err = 0;
578 int i;
579 struct timespec ts;
580
581 aio_completion_count = 0;
582 for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) {
583 if (aio_ex->fsp == fsp) {
584 aio_completion_count++;
585 }
586 }
587
588 if (!aio_completion_count) {
589 return 0;
590 }
591
592 DEBUG(3,("wait_for_aio_completion: waiting for %d aio events "
593 "to complete.\n", aio_completion_count ));
594
595 aiocb_list = SMB_MALLOC_ARRAY(const SMB_STRUCT_AIOCB *,
596 aio_completion_count);
597 if (!aiocb_list) {
598 return ENOMEM;
599 }
600
601 for( i = 0, aio_ex = aio_list_head;
602 aio_ex;
603 aio_ex = aio_ex->next) {
604 if (aio_ex->fsp == fsp) {
605 aiocb_list[i++] = &aio_ex->acb;
606 }
607 }
608
609 /* Now wait up to seconds_left for completion. */
610 ts.tv_sec = seconds_left;
611 ts.tv_nsec = 0;
612
613 DEBUG(10,("wait_for_aio_completion: %d events, doing a wait "
614 "of %d seconds.\n",
615 aio_completion_count, seconds_left ));
616
617 err = SMB_VFS_AIO_SUSPEND(fsp, aiocb_list,
618 aio_completion_count, &ts);
619
620 DEBUG(10,("wait_for_aio_completion: returned err = %d, "
621 "errno = %s\n", err, strerror(errno) ));
622
623 if (err == -1 && errno == EAGAIN) {
624 DEBUG(0,("wait_for_aio_completion: aio_suspend timed "
625 "out waiting for %d events after a wait of "
626 "%d seconds\n", aio_completion_count,
627 seconds_left));
628 /* Timeout. */
629 cancel_aio_by_fsp(fsp);
630 SAFE_FREE(aiocb_list);
631 return EIO;
632 }
633
634 /* One or more events might have completed - process them if
635 * so. */
636 for( i = 0; i < aio_completion_count; i++) {
637 uint16 mid = aiocb_list[i]->aio_sigevent.sigev_value.sival_int;
638
639 aio_ex = find_aio_ex(mid);
640
641 if (!aio_ex) {
642 DEBUG(0, ("wait_for_aio_completion: mid %u "
643 "doesn't match an aio record\n",
644 (unsigned int)mid ));
645 continue;
646 }
647
648 if (!handle_aio_completed(aio_ex, &err)) {
649 continue;
650 }
651 TALLOC_FREE(aio_ex);
652 }
653
654 SAFE_FREE(aiocb_list);
655 seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT
656 - (time(NULL) - start_time);
657 }
658
659 /* We timed out - we don't know why. Return ret if already an error,
660 * else EIO. */
661 DEBUG(10,("wait_for_aio_completion: aio_suspend timed out waiting "
662 "for %d events\n",
663 aio_completion_count));
664
665 return EIO;
666 }
667
668 /****************************************************************************
669 Cancel any outstanding aio requests. The client doesn't care about the reply.
670 *****************************************************************************/
671
672 void cancel_aio_by_fsp(files_struct *fsp)
/* [<][>][^][v][top][bottom][index][help] */
673 {
674 struct aio_extra *aio_ex;
675
676 for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) {
677 if (aio_ex->fsp == fsp) {
678 /* Don't delete the aio_extra record as we may have
679 completed and don't yet know it. Just do the
680 aio_cancel call and return. */
681 SMB_VFS_AIO_CANCEL(fsp, &aio_ex->acb);
682 aio_ex->fsp = NULL; /* fsp will be closed when we
683 * return. */
684 }
685 }
686 }
687
688 /****************************************************************************
689 Initialize the signal handler for aio read/write.
690 *****************************************************************************/
691
692 void initialize_async_io_handler(void)
/* [<][>][^][v][top][bottom][index][help] */
693 {
694 aio_signal_event = tevent_add_signal(smbd_event_context(),
695 smbd_event_context(),
696 RT_SIGNAL_AIO, SA_SIGINFO,
697 smbd_aio_signal_handler,
698 NULL);
699 if (!aio_signal_event) {
700 exit_server("Failed to setup RT_SIGNAL_AIO handler");
701 }
702
703 /* tevent supports 100 signal with SA_SIGINFO */
704 aio_pending_size = 100;
705 }
706
707 #else
708 void initialize_async_io_handler(void)
/* [<][>][^][v][top][bottom][index][help] */
709 {
710 }
711
712 bool schedule_aio_read_and_X(connection_struct *conn,
/* [<][>][^][v][top][bottom][index][help] */
713 struct smb_request *req,
714 files_struct *fsp, SMB_OFF_T startpos,
715 size_t smb_maxcnt)
716 {
717 return False;
718 }
719
720 bool schedule_aio_write_and_X(connection_struct *conn,
/* [<][>][^][v][top][bottom][index][help] */
721 struct smb_request *req,
722 files_struct *fsp, char *data,
723 SMB_OFF_T startpos,
724 size_t numtowrite)
725 {
726 return False;
727 }
728
729 void cancel_aio_by_fsp(files_struct *fsp)
/* [<][>][^][v][top][bottom][index][help] */
730 {
731 }
732
733 int wait_for_aio_completion(files_struct *fsp)
/* [<][>][^][v][top][bottom][index][help] */
734 {
735 return ENOSYS;
736 }
737
738 void smbd_aio_complete_mid(unsigned int mid);
739
740 #endif