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source: branches/samba-3.0/source/smbd/aio.c@ 621

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Last change on this file since 621 was 165, checked in by Paul Smedley, 17 years ago
Add 'missing' 3.0.34 diffs
File size: 23.4 KB

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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
35	struct 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
45	static 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
52	static 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
81	static 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
117	static 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
129	static 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
146	static sig_atomic_t signals_received;
147	static int outstanding_aio_calls;
148	static uint16 aio_pending_array[AIO_PENDING_SIZE];
149
150	/****************************************************************************
151	Signal handler when an aio request completes.
152	*****************************************************************************/
153
154	static 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
167	BOOL aio_finished(void)
168	{
169	return (signals_received != 0);
170	}
171
172	/****************************************************************************
173	Initialize the signal handler for aio read/write.
174	*****************************************************************************/
175
176	void 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
196	BOOL 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
256	become_root();
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);
261	unbecome_root();
262	return False;
263	}
264	unbecome_root();
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
280	BOOL 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
349	become_root();
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);
354	unbecome_root();
355	return False;
356	}
357	unbecome_root();
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
392	static 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
453	static 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
544	static 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
574	int 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
635	int 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
740	void 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
757	BOOL aio_finished(void)
758	{
759	return False;
760	}
761
762	void initialize_async_io_handler(void)
763	{
764	}
765
766	int process_aio_queue(void)
767	{
768	return False;
769	}
770
771	BOOL 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
780	BOOL 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
790	void cancel_aio_by_fsp(files_struct *fsp)
791	{
792	}
793
794	BOOL wait_for_aio_completion(files_struct *fsp)
795	{
796	return True;
797	}
798	#endif

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