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WHATSNEW: mention initial support for SMB3
[Samba/gebeck_regimport.git] / source3 / smbd / aio.c
blobec68b90452dca1c3c0c11bae320342b2172363d0
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/smbd.h"
23 #include "smbd/globals.h"
24 #include "../lib/util/tevent_ntstatus.h"
25
26 #if defined(HAVE_AIO)
27
28 /* The signal we'll use to signify aio done. */
29 #ifndef RT_SIGNAL_AIO
30 #define RT_SIGNAL_AIO (SIGRTMIN+3)
31 #endif
32
33 #ifndef HAVE_STRUCT_SIGEVENT_SIGEV_VALUE_SIVAL_PTR
34 #ifdef HAVE_STRUCT_SIGEVENT_SIGEV_VALUE_SIGVAL_PTR
35 #define sival_int sigval_int
36 #define sival_ptr sigval_ptr
37 #endif
38 #endif
39
40 /****************************************************************************
41 The buffer we keep around whilst an aio request is in process.
42 *****************************************************************************/
43
44 struct aio_extra {
45 struct aio_extra *next, *prev;
46 SMB_STRUCT_AIOCB acb;
47 files_struct *fsp;
48 struct smb_request *smbreq;
49 DATA_BLOB outbuf;
50 struct lock_struct lock;
51 bool write_through;
52 int (*handle_completion)(struct aio_extra *ex, int errcode);
53 };
54
55 /****************************************************************************
56 Initialize the signal handler for aio read/write.
57 *****************************************************************************/
58
59 static void smbd_aio_signal_handler(struct tevent_context *ev_ctx,
60 struct tevent_signal *se,
61 int signum, int count,
62 void *_info, void *private_data)
63 {
64 siginfo_t *info = (siginfo_t *)_info;
65 struct aio_extra *aio_ex = (struct aio_extra *)
66 info->si_value.sival_ptr;
67
68 smbd_aio_complete_aio_ex(aio_ex);
69 TALLOC_FREE(aio_ex);
70 }
71
72
73 bool initialize_async_io_handler(void)
74 {
75 static bool tried_signal_setup = false;
76
77 if (aio_signal_event) {
78 return true;
79 }
80 if (tried_signal_setup) {
81 return false;
82 }
83 tried_signal_setup = true;
84
85 aio_signal_event = tevent_add_signal(server_event_context(),
86 server_event_context(),
87 RT_SIGNAL_AIO, SA_SIGINFO,
88 smbd_aio_signal_handler,
89 NULL);
90 if (!aio_signal_event) {
91 DEBUG(10, ("Failed to setup RT_SIGNAL_AIO handler\n"));
92 return false;
93 }
94 return true;
95 }
96
97 static int handle_aio_read_complete(struct aio_extra *aio_ex, int errcode);
98 static int handle_aio_write_complete(struct aio_extra *aio_ex, int errcode);
99 static int handle_aio_smb2_read_complete(struct aio_extra *aio_ex, int errcode);
100 static int handle_aio_smb2_write_complete(struct aio_extra *aio_ex, int errcode);
101
102 static int aio_extra_destructor(struct aio_extra *aio_ex)
103 {
104 DLIST_REMOVE(aio_list_head, aio_ex);
105 outstanding_aio_calls--;
106 return 0;
107 }
108
109 /****************************************************************************
110 Create the extended aio struct we must keep around for the lifetime
111 of the aio call.
112 *****************************************************************************/
113
114 static struct aio_extra *create_aio_extra(TALLOC_CTX *mem_ctx,
115 files_struct *fsp,
116 size_t buflen)
117 {
118 struct aio_extra *aio_ex = talloc_zero(mem_ctx, struct aio_extra);
119
120 if (!aio_ex) {
121 return NULL;
122 }
123
124 /* The output buffer stored in the aio_ex is the start of
125 the smb return buffer. The buffer used in the acb
126 is the start of the reply data portion of that buffer. */
127
128 if (buflen) {
129 aio_ex->outbuf = data_blob_talloc(aio_ex, NULL, buflen);
130 if (!aio_ex->outbuf.data) {
131 TALLOC_FREE(aio_ex);
132 return NULL;
133 }
134 }
135 DLIST_ADD(aio_list_head, aio_ex);
136 talloc_set_destructor(aio_ex, aio_extra_destructor);
137 aio_ex->fsp = fsp;
138 outstanding_aio_calls++;
139 return aio_ex;
140 }
141
142 /****************************************************************************
143 Set up an aio request from a SMBreadX call.
144 *****************************************************************************/
145
146 NTSTATUS schedule_aio_read_and_X(connection_struct *conn,
147 struct smb_request *smbreq,
148 files_struct *fsp, off_t startpos,
149 size_t smb_maxcnt)
150 {
151 struct aio_extra *aio_ex;
152 SMB_STRUCT_AIOCB *a;
153 size_t bufsize;
154 size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
155 int ret;
156
157 if (fsp->base_fsp != NULL) {
158 /* No AIO on streams yet */
159 DEBUG(10, ("AIO on streams not yet supported\n"));
160 return NT_STATUS_RETRY;
161 }
162
163 if ((!min_aio_read_size || (smb_maxcnt < min_aio_read_size))
164 && !SMB_VFS_AIO_FORCE(fsp)) {
165 /* Too small a read for aio request. */
166 DEBUG(10,("schedule_aio_read_and_X: read size (%u) too small "
167 "for minimum aio_read of %u\n",
168 (unsigned int)smb_maxcnt,
169 (unsigned int)min_aio_read_size ));
170 return NT_STATUS_RETRY;
171 }
172
173 /* Only do this on non-chained and non-chaining reads not using the
174 * write cache. */
175 if (req_is_in_chain(smbreq) || (lp_write_cache_size(SNUM(conn)) != 0)) {
176 return NT_STATUS_RETRY;
177 }
178
179 if (outstanding_aio_calls >= aio_pending_size) {
180 DEBUG(10,("schedule_aio_read_and_X: Already have %d aio "
181 "activities outstanding.\n",
182 outstanding_aio_calls ));
183 return NT_STATUS_RETRY;
184 }
185
186 /* The following is safe from integer wrap as we've already checked
187 smb_maxcnt is 128k or less. Wct is 12 for read replies */
188
189 bufsize = smb_size + 12 * 2 + smb_maxcnt;
190
191 if ((aio_ex = create_aio_extra(NULL, fsp, bufsize)) == NULL) {
192 DEBUG(10,("schedule_aio_read_and_X: malloc fail.\n"));
193 return NT_STATUS_NO_MEMORY;
194 }
195 aio_ex->handle_completion = handle_aio_read_complete;
196
197 construct_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
198 srv_set_message((char *)aio_ex->outbuf.data, 12, 0, True);
199 SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
200
201 init_strict_lock_struct(fsp, (uint64_t)smbreq->smbpid,
202 (uint64_t)startpos, (uint64_t)smb_maxcnt, READ_LOCK,
203 &aio_ex->lock);
204
205 /* Take the lock until the AIO completes. */
206 if (!SMB_VFS_STRICT_LOCK(conn, fsp, &aio_ex->lock)) {
207 TALLOC_FREE(aio_ex);
208 return NT_STATUS_FILE_LOCK_CONFLICT;
209 }
210
211 a = &aio_ex->acb;
212
213 /* Now set up the aio record for the read call. */
214
215 a->aio_fildes = fsp->fh->fd;
216 a->aio_buf = smb_buf(aio_ex->outbuf.data);
217 a->aio_nbytes = smb_maxcnt;
218 a->aio_offset = startpos;
219 a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
220 a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
221 a->aio_sigevent.sigev_value.sival_ptr = aio_ex;
222
223 ret = SMB_VFS_AIO_READ(fsp, a);
224 if (ret == -1) {
225 DEBUG(0,("schedule_aio_read_and_X: aio_read failed. "
226 "Error %s\n", strerror(errno) ));
227 SMB_VFS_STRICT_UNLOCK(conn, fsp, &aio_ex->lock);
228 TALLOC_FREE(aio_ex);
229 return NT_STATUS_RETRY;
230 }
231
232 aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
233
234 DEBUG(10,("schedule_aio_read_and_X: scheduled aio_read for file %s, "
235 "offset %.0f, len = %u (mid = %u)\n",
236 fsp_str_dbg(fsp), (double)startpos, (unsigned int)smb_maxcnt,
237 (unsigned int)aio_ex->smbreq->mid ));
238
239 return NT_STATUS_OK;
240 }
241
242 /****************************************************************************
243 Set up an aio request from a SMBwriteX call.
244 *****************************************************************************/
245
246 NTSTATUS schedule_aio_write_and_X(connection_struct *conn,
247 struct smb_request *smbreq,
248 files_struct *fsp, const char *data,
249 off_t startpos,
250 size_t numtowrite)
251 {
252 struct aio_extra *aio_ex;
253 SMB_STRUCT_AIOCB *a;
254 size_t bufsize;
255 size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
256 int ret;
257
258 if (fsp->base_fsp != NULL) {
259 /* No AIO on streams yet */
260 DEBUG(10, ("AIO on streams not yet supported\n"));
261 return NT_STATUS_RETRY;
262 }
263
264 if ((!min_aio_write_size || (numtowrite < min_aio_write_size))
265 && !SMB_VFS_AIO_FORCE(fsp)) {
266 /* Too small a write for aio request. */
267 DEBUG(10,("schedule_aio_write_and_X: write size (%u) too "
268 "small for minimum aio_write of %u\n",
269 (unsigned int)numtowrite,
270 (unsigned int)min_aio_write_size ));
271 return NT_STATUS_RETRY;
272 }
273
274 /* Only do this on non-chained and non-chaining writes not using the
275 * write cache. */
276 if (req_is_in_chain(smbreq) || (lp_write_cache_size(SNUM(conn)) != 0)) {
277 return NT_STATUS_RETRY;
278 }
279
280 if (outstanding_aio_calls >= aio_pending_size) {
281 DEBUG(3,("schedule_aio_write_and_X: Already have %d aio "
282 "activities outstanding.\n",
283 outstanding_aio_calls ));
284 DEBUG(10,("schedule_aio_write_and_X: failed to schedule "
285 "aio_write for file %s, offset %.0f, len = %u "
286 "(mid = %u)\n",
287 fsp_str_dbg(fsp), (double)startpos,
288 (unsigned int)numtowrite,
289 (unsigned int)smbreq->mid ));
290 return NT_STATUS_RETRY;
291 }
292
293 bufsize = smb_size + 6*2;
294
295 if (!(aio_ex = create_aio_extra(NULL, fsp, bufsize))) {
296 DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n"));
297 return NT_STATUS_NO_MEMORY;
298 }
299 aio_ex->handle_completion = handle_aio_write_complete;
300 aio_ex->write_through = BITSETW(smbreq->vwv+7,0);
301
302 construct_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
303 srv_set_message((char *)aio_ex->outbuf.data, 6, 0, True);
304 SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
305
306 init_strict_lock_struct(fsp, (uint64_t)smbreq->smbpid,
307 (uint64_t)startpos, (uint64_t)numtowrite, WRITE_LOCK,
308 &aio_ex->lock);
309
310 /* Take the lock until the AIO completes. */
311 if (!SMB_VFS_STRICT_LOCK(conn, fsp, &aio_ex->lock)) {
312 TALLOC_FREE(aio_ex);
313 return NT_STATUS_FILE_LOCK_CONFLICT;
314 }
315
316 a = &aio_ex->acb;
317
318 /* Now set up the aio record for the write call. */
319
320 a->aio_fildes = fsp->fh->fd;
321 a->aio_buf = discard_const_p(char, data);
322 a->aio_nbytes = numtowrite;
323 a->aio_offset = startpos;
324 a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
325 a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
326 a->aio_sigevent.sigev_value.sival_ptr = aio_ex;
327
328 ret = SMB_VFS_AIO_WRITE(fsp, a);
329 if (ret == -1) {
330 DEBUG(3,("schedule_aio_wrote_and_X: aio_write failed. "
331 "Error %s\n", strerror(errno) ));
332 SMB_VFS_STRICT_UNLOCK(conn, fsp, &aio_ex->lock);
333 TALLOC_FREE(aio_ex);
334 return NT_STATUS_RETRY;
335 }
336
337 aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
338
339 /* This should actually be improved to span the write. */
340 contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
341 contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
342
343 if (!aio_ex->write_through && !lp_syncalways(SNUM(fsp->conn))
344 && fsp->aio_write_behind) {
345 /* Lie to the client and immediately claim we finished the
346 * write. */
347 SSVAL(aio_ex->outbuf.data,smb_vwv2,numtowrite);
348 SSVAL(aio_ex->outbuf.data,smb_vwv4,(numtowrite>>16)&1);
349 show_msg((char *)aio_ex->outbuf.data);
350 if (!srv_send_smb(aio_ex->smbreq->sconn,
351 (char *)aio_ex->outbuf.data,
352 true, aio_ex->smbreq->seqnum+1,
353 IS_CONN_ENCRYPTED(fsp->conn),
354 &aio_ex->smbreq->pcd)) {
355 exit_server_cleanly("schedule_aio_write_and_X: "
356 "srv_send_smb failed.");
357 }
358 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write "
359 "behind for file %s\n", fsp_str_dbg(fsp)));
360 }
361
362 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write for file "
363 "%s, offset %.0f, len = %u (mid = %u) "
364 "outstanding_aio_calls = %d\n",
365 fsp_str_dbg(fsp), (double)startpos, (unsigned int)numtowrite,
366 (unsigned int)aio_ex->smbreq->mid, outstanding_aio_calls ));
367
368 return NT_STATUS_OK;
369 }
370
371 bool cancel_smb2_aio(struct smb_request *smbreq)
372 {
373 struct smbd_smb2_request *smb2req = smbreq->smb2req;
374 struct aio_extra *aio_ex = NULL;
375 int ret;
376
377 if (smb2req) {
378 aio_ex = talloc_get_type(smbreq->async_priv,
379 struct aio_extra);
380 }
381
382 if (aio_ex == NULL) {
383 return false;
384 }
385
386 if (aio_ex->fsp == NULL) {
387 return false;
388 }
389
390 ret = SMB_VFS_AIO_CANCEL(aio_ex->fsp, &aio_ex->acb);
391 if (ret != AIO_CANCELED) {
392 return false;
393 }
394
395 return true;
396 }
397
398 /****************************************************************************
399 Set up an aio request from a SMB2 read call.
400 *****************************************************************************/
401
402 NTSTATUS schedule_smb2_aio_read(connection_struct *conn,
403 struct smb_request *smbreq,
404 files_struct *fsp,
405 TALLOC_CTX *ctx,
406 DATA_BLOB *preadbuf,
407 off_t startpos,
408 size_t smb_maxcnt)
409 {
410 struct aio_extra *aio_ex;
411 SMB_STRUCT_AIOCB *a;
412 size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
413 int ret;
414
415 if (fsp->base_fsp != NULL) {
416 /* No AIO on streams yet */
417 DEBUG(10, ("AIO on streams not yet supported\n"));
418 return NT_STATUS_RETRY;
419 }
420
421 if ((!min_aio_read_size || (smb_maxcnt < min_aio_read_size))
422 && !SMB_VFS_AIO_FORCE(fsp)) {
423 /* Too small a read for aio request. */
424 DEBUG(10,("smb2: read size (%u) too small "
425 "for minimum aio_read of %u\n",
426 (unsigned int)smb_maxcnt,
427 (unsigned int)min_aio_read_size ));
428 return NT_STATUS_RETRY;
429 }
430
431 /* Only do this on reads not using the write cache. */
432 if (lp_write_cache_size(SNUM(conn)) != 0) {
433 return NT_STATUS_RETRY;
434 }
435
436 if (outstanding_aio_calls >= aio_pending_size) {
437 DEBUG(10,("smb2: Already have %d aio "
438 "activities outstanding.\n",
439 outstanding_aio_calls ));
440 return NT_STATUS_RETRY;
441 }
442
443 /* Create the out buffer. */
444 *preadbuf = data_blob_talloc(ctx, NULL, smb_maxcnt);
445 if (preadbuf->data == NULL) {
446 return NT_STATUS_NO_MEMORY;
447 }
448
449 if (!(aio_ex = create_aio_extra(smbreq->smb2req, fsp, 0))) {
450 return NT_STATUS_NO_MEMORY;
451 }
452 aio_ex->handle_completion = handle_aio_smb2_read_complete;
453
454 init_strict_lock_struct(fsp, (uint64_t)smbreq->smbpid,
455 (uint64_t)startpos, (uint64_t)smb_maxcnt, READ_LOCK,
456 &aio_ex->lock);
457
458 /* Take the lock until the AIO completes. */
459 if (!SMB_VFS_STRICT_LOCK(conn, fsp, &aio_ex->lock)) {
460 TALLOC_FREE(aio_ex);
461 return NT_STATUS_FILE_LOCK_CONFLICT;
462 }
463
464 a = &aio_ex->acb;
465
466 /* Now set up the aio record for the read call. */
467
468 a->aio_fildes = fsp->fh->fd;
469 a->aio_buf = preadbuf->data;
470 a->aio_nbytes = smb_maxcnt;
471 a->aio_offset = startpos;
472 a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
473 a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
474 a->aio_sigevent.sigev_value.sival_ptr = aio_ex;
475
476 ret = SMB_VFS_AIO_READ(fsp, a);
477 if (ret == -1) {
478 DEBUG(0,("smb2: aio_read failed. "
479 "Error %s\n", strerror(errno) ));
480 SMB_VFS_STRICT_UNLOCK(conn, fsp, &aio_ex->lock);
481 TALLOC_FREE(aio_ex);
482 return NT_STATUS_RETRY;
483 }
484
485 /* We don't need talloc_move here as both aio_ex and
486 * smbreq are children of smbreq->smb2req. */
487 aio_ex->smbreq = smbreq;
488 smbreq->async_priv = aio_ex;
489
490 DEBUG(10,("smb2: scheduled aio_read for file %s, "
491 "offset %.0f, len = %u (mid = %u)\n",
492 fsp_str_dbg(fsp), (double)startpos, (unsigned int)smb_maxcnt,
493 (unsigned int)aio_ex->smbreq->mid ));
494
495 return NT_STATUS_OK;
496 }
497
498 /****************************************************************************
499 Set up an aio request from a SMB2write call.
500 *****************************************************************************/
501
502 NTSTATUS schedule_aio_smb2_write(connection_struct *conn,
503 struct smb_request *smbreq,
504 files_struct *fsp,
505 uint64_t in_offset,
506 DATA_BLOB in_data,
507 bool write_through)
508 {
509 struct aio_extra *aio_ex = NULL;
510 SMB_STRUCT_AIOCB *a = NULL;
511 size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
512 int ret;
513
514 if (fsp->base_fsp != NULL) {
515 /* No AIO on streams yet */
516 DEBUG(10, ("AIO on streams not yet supported\n"));
517 return NT_STATUS_RETRY;
518 }
519
520 if ((!min_aio_write_size || (in_data.length < min_aio_write_size))
521 && !SMB_VFS_AIO_FORCE(fsp)) {
522 /* Too small a write for aio request. */
523 DEBUG(10,("smb2: write size (%u) too "
524 "small for minimum aio_write of %u\n",
525 (unsigned int)in_data.length,
526 (unsigned int)min_aio_write_size ));
527 return NT_STATUS_RETRY;
528 }
529
530 /* Only do this on writes not using the write cache. */
531 if (lp_write_cache_size(SNUM(conn)) != 0) {
532 return NT_STATUS_RETRY;
533 }
534
535 if (outstanding_aio_calls >= aio_pending_size) {
536 DEBUG(3,("smb2: Already have %d aio "
537 "activities outstanding.\n",
538 outstanding_aio_calls ));
539 return NT_STATUS_RETRY;
540 }
541
542 if (!(aio_ex = create_aio_extra(smbreq->smb2req, fsp, 0))) {
543 return NT_STATUS_NO_MEMORY;
544 }
545
546 aio_ex->handle_completion = handle_aio_smb2_write_complete;
547 aio_ex->write_through = write_through;
548
549 init_strict_lock_struct(fsp, (uint64_t)smbreq->smbpid,
550 in_offset, (uint64_t)in_data.length, WRITE_LOCK,
551 &aio_ex->lock);
552
553 /* Take the lock until the AIO completes. */
554 if (!SMB_VFS_STRICT_LOCK(conn, fsp, &aio_ex->lock)) {
555 TALLOC_FREE(aio_ex);
556 return NT_STATUS_FILE_LOCK_CONFLICT;
557 }
558
559 a = &aio_ex->acb;
560
561 /* Now set up the aio record for the write call. */
562
563 a->aio_fildes = fsp->fh->fd;
564 a->aio_buf = in_data.data;
565 a->aio_nbytes = in_data.length;
566 a->aio_offset = in_offset;
567 a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
568 a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
569 a->aio_sigevent.sigev_value.sival_ptr = aio_ex;
570
571 ret = SMB_VFS_AIO_WRITE(fsp, a);
572 if (ret == -1) {
573 DEBUG(3,("smb2: aio_write failed. "
574 "Error %s\n", strerror(errno) ));
575 SMB_VFS_STRICT_UNLOCK(conn, fsp, &aio_ex->lock);
576 TALLOC_FREE(aio_ex);
577 return NT_STATUS_RETRY;
578 }
579
580 /* We don't need talloc_move here as both aio_ex and
581 * smbreq are children of smbreq->smb2req. */
582 aio_ex->smbreq = smbreq;
583 smbreq->async_priv = aio_ex;
584
585 /* This should actually be improved to span the write. */
586 contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
587 contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
588
589 /*
590 * We don't want to do write behind due to ownership
591 * issues of the request structs. Maybe add it if I
592 * figure those out. JRA.
593 */
594
595 DEBUG(10,("smb2: scheduled aio_write for file "
596 "%s, offset %.0f, len = %u (mid = %u) "
597 "outstanding_aio_calls = %d\n",
598 fsp_str_dbg(fsp),
599 (double)in_offset,
600 (unsigned int)in_data.length,
601 (unsigned int)aio_ex->smbreq->mid,
602 outstanding_aio_calls ));
603
604 return NT_STATUS_OK;
605 }
606
607 /****************************************************************************
608 Complete the read and return the data or error back to the client.
609 Returns errno or zero if all ok.
610 *****************************************************************************/
611
612 static int handle_aio_read_complete(struct aio_extra *aio_ex, int errcode)
613 {
614 int outsize;
615 char *outbuf = (char *)aio_ex->outbuf.data;
616 char *data = smb_buf(outbuf);
617 ssize_t nread = SMB_VFS_AIO_RETURN(aio_ex->fsp,&aio_ex->acb);
618
619 if (nread < 0) {
620 /* We're relying here on the fact that if the fd is
621 closed then the aio will complete and aio_return
622 will return an error. Hopefully this is
623 true.... JRA. */
624
625 DEBUG( 3,( "handle_aio_read_complete: file %s nread == %d. "
626 "Error = %s\n",
627 fsp_str_dbg(aio_ex->fsp), (int)nread, strerror(errcode)));
628
629 ERROR_NT(map_nt_error_from_unix(errcode));
630 outsize = srv_set_message(outbuf,0,0,true);
631 } else {
632 outsize = srv_set_message(outbuf,12,nread,False);
633 SSVAL(outbuf,smb_vwv2,0xFFFF); /* Remaining - must be * -1. */
634 SSVAL(outbuf,smb_vwv5,nread);
635 SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf));
636 SSVAL(outbuf,smb_vwv7,((nread >> 16) & 1));
637 SSVAL(smb_buf(outbuf),-2,nread);
638
639 aio_ex->fsp->fh->pos = aio_ex->acb.aio_offset + nread;
640 aio_ex->fsp->fh->position_information = aio_ex->fsp->fh->pos;
641
642 DEBUG( 3, ( "handle_aio_read_complete file %s max=%d "
643 "nread=%d\n",
644 fsp_str_dbg(aio_ex->fsp),
645 (int)aio_ex->acb.aio_nbytes, (int)nread ) );
646
647 }
648 smb_setlen(outbuf,outsize - 4);
649 show_msg(outbuf);
650 if (!srv_send_smb(aio_ex->smbreq->sconn, outbuf,
651 true, aio_ex->smbreq->seqnum+1,
652 IS_CONN_ENCRYPTED(aio_ex->fsp->conn), NULL)) {
653 exit_server_cleanly("handle_aio_read_complete: srv_send_smb "
654 "failed.");
655 }
656
657 DEBUG(10,("handle_aio_read_complete: scheduled aio_read completed "
658 "for file %s, offset %.0f, len = %u\n",
659 fsp_str_dbg(aio_ex->fsp), (double)aio_ex->acb.aio_offset,
660 (unsigned int)nread ));
661
662 return errcode;
663 }
664
665 /****************************************************************************
666 Complete the write and return the data or error back to the client.
667 Returns error code or zero if all ok.
668 *****************************************************************************/
669
670 static int handle_aio_write_complete(struct aio_extra *aio_ex, int errcode)
671 {
672 files_struct *fsp = aio_ex->fsp;
673 char *outbuf = (char *)aio_ex->outbuf.data;
674 ssize_t numtowrite = aio_ex->acb.aio_nbytes;
675 ssize_t nwritten = SMB_VFS_AIO_RETURN(fsp,&aio_ex->acb);
676
677 if (fsp->aio_write_behind) {
678 if (nwritten != numtowrite) {
679 if (nwritten == -1) {
680 DEBUG(5,("handle_aio_write_complete: "
681 "aio_write_behind failed ! File %s "
682 "is corrupt ! Error %s\n",
683 fsp_str_dbg(fsp), strerror(errcode)));
684 } else {
685 DEBUG(0,("handle_aio_write_complete: "
686 "aio_write_behind failed ! File %s "
687 "is corrupt ! Wanted %u bytes but "
688 "only wrote %d\n", fsp_str_dbg(fsp),
689 (unsigned int)numtowrite,
690 (int)nwritten ));
691 errcode = EIO;
692 }
693 } else {
694 DEBUG(10,("handle_aio_write_complete: "
695 "aio_write_behind completed for file %s\n",
696 fsp_str_dbg(fsp)));
697 }
698 /* TODO: should no return 0 in case of an error !!! */
699 return 0;
700 }
701
702 /* We don't need outsize or set_message here as we've already set the
703 fixed size length when we set up the aio call. */
704
705 if(nwritten == -1) {
706 DEBUG( 3,( "handle_aio_write: file %s wanted %u bytes. "
707 "nwritten == %d. Error = %s\n",
708 fsp_str_dbg(fsp), (unsigned int)numtowrite,
709 (int)nwritten, strerror(errcode) ));
710
711 ERROR_NT(map_nt_error_from_unix(errcode));
712 srv_set_message(outbuf,0,0,true);
713 } else {
714 NTSTATUS status;
715
716 SSVAL(outbuf,smb_vwv2,nwritten);
717 SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1);
718 if (nwritten < (ssize_t)numtowrite) {
719 SCVAL(outbuf,smb_rcls,ERRHRD);
720 SSVAL(outbuf,smb_err,ERRdiskfull);
721 }
722
723 DEBUG(3,("handle_aio_write: %s, num=%d wrote=%d\n",
724 fsp_fnum_dbg(fsp), (int)numtowrite, (int)nwritten));
725 status = sync_file(fsp->conn,fsp, aio_ex->write_through);
726 if (!NT_STATUS_IS_OK(status)) {
727 errcode = errno;
728 ERROR_BOTH(map_nt_error_from_unix(errcode),
729 ERRHRD, ERRdiskfull);
730 srv_set_message(outbuf,0,0,true);
731 DEBUG(5,("handle_aio_write: sync_file for %s returned %s\n",
732 fsp_str_dbg(fsp), nt_errstr(status)));
733 }
734
735 aio_ex->fsp->fh->pos = aio_ex->acb.aio_offset + nwritten;
736 }
737
738 show_msg(outbuf);
739 if (!srv_send_smb(aio_ex->smbreq->sconn, outbuf,
740 true, aio_ex->smbreq->seqnum+1,
741 IS_CONN_ENCRYPTED(fsp->conn),
742 NULL)) {
743 exit_server_cleanly("handle_aio_write_complete: "
744 "srv_send_smb failed.");
745 }
746
747 DEBUG(10,("handle_aio_write_complete: scheduled aio_write completed "
748 "for file %s, offset %.0f, requested %u, written = %u\n",
749 fsp_str_dbg(fsp), (double)aio_ex->acb.aio_offset,
750 (unsigned int)numtowrite, (unsigned int)nwritten ));
751
752 return errcode;
753 }
754
755 /****************************************************************************
756 Complete the read and return the data or error back to the client.
757 Returns errno or zero if all ok.
758 *****************************************************************************/
759
760 static int handle_aio_smb2_read_complete(struct aio_extra *aio_ex, int errcode)
761 {
762 NTSTATUS status;
763 struct tevent_req *subreq = aio_ex->smbreq->smb2req->subreq;
764 ssize_t nread = SMB_VFS_AIO_RETURN(aio_ex->fsp,&aio_ex->acb);
765
766 /* Common error or success code processing for async or sync
767 read returns. */
768
769 status = smb2_read_complete(subreq, nread, errcode);
770
771 if (nread > 0) {
772 aio_ex->fsp->fh->pos = aio_ex->acb.aio_offset + nread;
773 aio_ex->fsp->fh->position_information = aio_ex->fsp->fh->pos;
774 }
775
776 DEBUG(10,("smb2: scheduled aio_read completed "
777 "for file %s, offset %.0f, len = %u "
778 "(errcode = %d, NTSTATUS = %s)\n",
779 fsp_str_dbg(aio_ex->fsp),
780 (double)aio_ex->acb.aio_offset,
781 (unsigned int)nread,
782 errcode,
783 nt_errstr(status) ));
784
785 if (!NT_STATUS_IS_OK(status)) {
786 tevent_req_nterror(subreq, status);
787 return errcode;
788 }
789
790 tevent_req_done(subreq);
791 return errcode;
792 }
793
794 /****************************************************************************
795 Complete the SMB2 write and return the data or error back to the client.
796 Returns error code or zero if all ok.
797 *****************************************************************************/
798
799 static int handle_aio_smb2_write_complete(struct aio_extra *aio_ex, int errcode)
800 {
801 files_struct *fsp = aio_ex->fsp;
802 ssize_t numtowrite = aio_ex->acb.aio_nbytes;
803 ssize_t nwritten = SMB_VFS_AIO_RETURN(fsp,&aio_ex->acb);
804 struct tevent_req *subreq = aio_ex->smbreq->smb2req->subreq;
805 NTSTATUS status;
806
807 status = smb2_write_complete(subreq, nwritten, errcode);
808
809 DEBUG(10,("smb2: scheduled aio_write completed "
810 "for file %s, offset %.0f, requested %u, "
811 "written = %u (errcode = %d, NTSTATUS = %s)\n",
812 fsp_str_dbg(fsp),
813 (double)aio_ex->acb.aio_offset,
814 (unsigned int)numtowrite,
815 (unsigned int)nwritten,
816 errcode,
817 nt_errstr(status) ));
818
819 if (!NT_STATUS_IS_OK(status)) {
820 tevent_req_nterror(subreq, status);
821 return errcode;
822 }
823
824 tevent_req_done(subreq);
825 return errcode;
826 }
827
828 /****************************************************************************
829 Handle any aio completion. Returns True if finished (and sets *perr if err
830 was non-zero), False if not.
831 *****************************************************************************/
832
833 static bool handle_aio_completed(struct aio_extra *aio_ex, int *perr)
834 {
835 files_struct *fsp = NULL;
836 int err;
837
838 if(!aio_ex) {
839 DEBUG(3, ("handle_aio_completed: Non-existing aio_ex passed\n"));
840 return false;
841 }
842
843 if (!aio_ex->fsp) {
844 DEBUG(3, ("handle_aio_completed: aio_ex->fsp == NULL\n"));
845 return false;
846 }
847
848 fsp = aio_ex->fsp;
849
850 /* Ensure the operation has really completed. */
851 err = SMB_VFS_AIO_ERROR(fsp, &aio_ex->acb);
852 if (err == EINPROGRESS) {
853 DEBUG(10,( "handle_aio_completed: operation mid %llu still in "
854 "process for file %s\n",
855 (unsigned long long)aio_ex->smbreq->mid,
856 fsp_str_dbg(aio_ex->fsp)));
857 return False;
858 }
859
860 if (err == ECANCELED) {
861 DEBUG(10,( "handle_aio_completed: operation mid %llu canceled "
862 "for file %s\n",
863 (unsigned long long)aio_ex->smbreq->mid,
864 fsp_str_dbg(aio_ex->fsp)));
865 }
866
867 /* Unlock now we're done. */
868 SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &aio_ex->lock);
869
870 err = aio_ex->handle_completion(aio_ex, err);
871 if (err) {
872 *perr = err; /* Only save non-zero errors. */
873 }
874
875 return True;
876 }
877
878 /****************************************************************************
879 Handle any aio completion inline.
880 *****************************************************************************/
881
882 void smbd_aio_complete_aio_ex(struct aio_extra *aio_ex)
883 {
884 files_struct *fsp = NULL;
885 int ret = 0;
886
887 DEBUG(10,("smbd_aio_complete_mid: mid[%llu]\n",
888 (unsigned long long)aio_ex->smbreq->mid));
889
890 fsp = aio_ex->fsp;
891 if (fsp == NULL) {
892 /* file was closed whilst I/O was outstanding. Just
893 * ignore. */
894 DEBUG( 3,( "smbd_aio_complete_mid: file closed whilst "
895 "aio outstanding (mid[%llu]).\n",
896 (unsigned long long)aio_ex->smbreq->mid));
897 return;
898 }
899
900 if (!handle_aio_completed(aio_ex, &ret)) {
901 return;
902 }
903 }
904
905 /****************************************************************************
906 We're doing write behind and the client closed the file. Wait up to 45
907 seconds (my arbitrary choice) for the aio to complete. Return 0 if all writes
908 completed, errno to return if not.
909 *****************************************************************************/
910
911 #define SMB_TIME_FOR_AIO_COMPLETE_WAIT 45
912
913 int wait_for_aio_completion(files_struct *fsp)
914 {
915 struct aio_extra *aio_ex;
916 const SMB_STRUCT_AIOCB **aiocb_list;
917 int aio_completion_count = 0;
918 time_t start_time = time_mono(NULL);
919 int seconds_left;
920
921 for (seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT;
922 seconds_left >= 0;) {
923 int err = 0;
924 int i;
925 struct timespec ts;
926
927 aio_completion_count = 0;
928 for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) {
929 if (aio_ex->fsp == fsp) {
930 aio_completion_count++;
931 }
932 }
933
934 if (!aio_completion_count) {
935 return 0;
936 }
937
938 DEBUG(3,("wait_for_aio_completion: waiting for %d aio events "
939 "to complete.\n", aio_completion_count ));
940
941 aiocb_list = SMB_MALLOC_ARRAY(const SMB_STRUCT_AIOCB *,
942 aio_completion_count);
943 if (!aiocb_list) {
944 return ENOMEM;
945 }
946
947 for( i = 0, aio_ex = aio_list_head;
948 aio_ex;
949 aio_ex = aio_ex->next) {
950 if (aio_ex->fsp == fsp) {
951 aiocb_list[i++] = &aio_ex->acb;
952 }
953 }
954
955 /* Now wait up to seconds_left for completion. */
956 ts.tv_sec = seconds_left;
957 ts.tv_nsec = 0;
958
959 DEBUG(10,("wait_for_aio_completion: %d events, doing a wait "
960 "of %d seconds.\n",
961 aio_completion_count, seconds_left ));
962
963 err = SMB_VFS_AIO_SUSPEND(fsp, aiocb_list,
964 aio_completion_count, &ts);
965
966 DEBUG(10,("wait_for_aio_completion: returned err = %d, "
967 "errno = %s\n", err, strerror(errno) ));
968
969 if (err == -1 && errno == EAGAIN) {
970 DEBUG(0,("wait_for_aio_completion: aio_suspend timed "
971 "out waiting for %d events after a wait of "
972 "%d seconds\n", aio_completion_count,
973 seconds_left));
974 /* Timeout. */
975 SAFE_FREE(aiocb_list);
976 /* We're hosed here - IO may complete
977 and trample over memory if we free
978 the aio_ex struct, but if we don't
979 we leak IO requests. I think smb_panic()
980 if the right thing to do here. JRA.
981 */
982 smb_panic("AIO suspend timed out - cannot continue.");
983 return EIO;
984 }
985
986 /* One or more events might have completed - process them if
987 * so. */
988 for( i = 0; i < aio_completion_count; i++) {
989 aio_ex = (struct aio_extra *)aiocb_list[i]->aio_sigevent.sigev_value.sival_ptr;
990
991 if (!handle_aio_completed(aio_ex, &err)) {
992 continue;
993 }
994 TALLOC_FREE(aio_ex);
995 }
996
997 SAFE_FREE(aiocb_list);
998 seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT
999 - (time_mono(NULL) - start_time);
1000 }
1001
1002 /* We timed out - we don't know why. Return ret if already an error,
1003 * else EIO. */
1004 DEBUG(10,("wait_for_aio_completion: aio_suspend timed out waiting "
1005 "for %d events\n",
1006 aio_completion_count));
1007
1008 return EIO;
1009 }
1010
1011 #else
1012
1013 bool initialize_async_io_handler(void)
1014 {
1015 return false;
1016 }
1017
1018 NTSTATUS schedule_aio_read_and_X(connection_struct *conn,
1019 struct smb_request *smbreq,
1020 files_struct *fsp, off_t startpos,
1021 size_t smb_maxcnt)
1022 {
1023 return NT_STATUS_RETRY;
1024 }
1025
1026 NTSTATUS schedule_aio_write_and_X(connection_struct *conn,
1027 struct smb_request *smbreq,
1028 files_struct *fsp, const char *data,
1029 off_t startpos,
1030 size_t numtowrite)
1031 {
1032 return NT_STATUS_RETRY;
1033 }
1034
1035 bool cancel_smb2_aio(struct smb_request *smbreq)
1036 {
1037 return false;
1038 }
1039
1040 NTSTATUS schedule_smb2_aio_read(connection_struct *conn,
1041 struct smb_request *smbreq,
1042 files_struct *fsp,
1043 TALLOC_CTX *ctx,
1044 DATA_BLOB *preadbuf,
1045 off_t startpos,
1046 size_t smb_maxcnt)
1047 {
1048 return NT_STATUS_RETRY;
1049 }
1050
1051 NTSTATUS schedule_aio_smb2_write(connection_struct *conn,
1052 struct smb_request *smbreq,
1053 files_struct *fsp,
1054 uint64_t in_offset,
1055 DATA_BLOB in_data,
1056 bool write_through)
1057 {
1058 return NT_STATUS_RETRY;
1059 }
1060
1061 int wait_for_aio_completion(files_struct *fsp)
1062 {
1063 return 0;
1064 }
1065
1066 void smbd_aio_complete_mid(uint64_t mid);
1067
1068 #endif
reg import