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source: vendor/3.6.0/source3/smbd/aio.c

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Last change on this file was 740, checked in by Silvan Scherrer, 13 years ago
Samba Server: update vendor to 3.6.0
File size: 32.2 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 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(WITH_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	}
70
71
72	static bool initialize_async_io_handler(void)
73	{
74	static bool tried_signal_setup = false;
75
76	if (aio_signal_event) {
77	return true;
78	}
79	if (tried_signal_setup) {
80	return false;
81	}
82	tried_signal_setup = true;
83
84	aio_signal_event = tevent_add_signal(smbd_event_context(),
85	smbd_event_context(),
86	RT_SIGNAL_AIO, SA_SIGINFO,
87	smbd_aio_signal_handler,
88	NULL);
89	if (!aio_signal_event) {
90	DEBUG(10, ("Failed to setup RT_SIGNAL_AIO handler\n"));
91	return false;
92	}
93
94	/* tevent supports 100 signal with SA_SIGINFO */
95	aio_pending_size = 100;
96	return true;
97	}
98
99	static int handle_aio_read_complete(struct aio_extra *aio_ex, int errcode);
100	static int handle_aio_write_complete(struct aio_extra *aio_ex, int errcode);
101	static int handle_aio_smb2_read_complete(struct aio_extra *aio_ex, int errcode);
102	static int handle_aio_smb2_write_complete(struct aio_extra *aio_ex, int errcode);
103
104	static int aio_extra_destructor(struct aio_extra *aio_ex)
105	{
106	DLIST_REMOVE(aio_list_head, aio_ex);
107	return 0;
108	}
109
110	/****************************************************************************
111	Create the extended aio struct we must keep around for the lifetime
112	of the aio call.
113	*****************************************************************************/
114
115	static struct aio_extra create_aio_extra(TALLOC_CTX mem_ctx,
116	files_struct *fsp,
117	size_t buflen)
118	{
119	struct aio_extra *aio_ex = TALLOC_ZERO_P(mem_ctx, struct aio_extra);
120
121	if (!aio_ex) {
122	return NULL;
123	}
124
125	/* The output buffer stored in the aio_ex is the start of
126	the smb return buffer. The buffer used in the acb
127	is the start of the reply data portion of that buffer. */
128
129	if (buflen) {
130	aio_ex->outbuf = data_blob_talloc(aio_ex, NULL, buflen);
131	if (!aio_ex->outbuf.data) {
132	TALLOC_FREE(aio_ex);
133	return NULL;
134	}
135	}
136	DLIST_ADD(aio_list_head, aio_ex);
137	talloc_set_destructor(aio_ex, aio_extra_destructor);
138	aio_ex->fsp = fsp;
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, SMB_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	/* Ensure aio is initialized. */
158	if (!initialize_async_io_handler()) {
159	return NT_STATUS_RETRY;
160	}
161
162	if (fsp->base_fsp != NULL) {
163	/* No AIO on streams yet */
164	DEBUG(10, ("AIO on streams not yet supported\n"));
165	return NT_STATUS_RETRY;
166	}
167
168	if ((!min_aio_read_size \|\| (smb_maxcnt < min_aio_read_size))
169	&& !SMB_VFS_AIO_FORCE(fsp)) {
170	/* Too small a read for aio request. */
171	DEBUG(10,("schedule_aio_read_and_X: read size (%u) too small "
172	"for minimum aio_read of %u\n",
173	(unsigned int)smb_maxcnt,
174	(unsigned int)min_aio_read_size ));
175	return NT_STATUS_RETRY;
176	}
177
178	/* Only do this on non-chained and non-chaining reads not using the
179	* write cache. */
180	if (req_is_in_chain(smbreq) \|\| (lp_write_cache_size(SNUM(conn)) != 0)) {
181	return NT_STATUS_RETRY;
182	}
183
184	if (outstanding_aio_calls >= aio_pending_size) {
185	DEBUG(10,("schedule_aio_read_and_X: Already have %d aio "
186	"activities outstanding.\n",
187	outstanding_aio_calls ));
188	return NT_STATUS_RETRY;
189	}
190
191	/* The following is safe from integer wrap as we've already checked
192	smb_maxcnt is 128k or less. Wct is 12 for read replies */
193
194	bufsize = smb_size + 12 * 2 + smb_maxcnt;
195
196	if ((aio_ex = create_aio_extra(NULL, fsp, bufsize)) == NULL) {
197	DEBUG(10,("schedule_aio_read_and_X: malloc fail.\n"));
198	return NT_STATUS_NO_MEMORY;
199	}
200	aio_ex->handle_completion = handle_aio_read_complete;
201
202	construct_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
203	srv_set_message((char *)aio_ex->outbuf.data, 12, 0, True);
204	SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
205
206	init_strict_lock_struct(fsp, (uint64_t)smbreq->smbpid,
207	(uint64_t)startpos, (uint64_t)smb_maxcnt, READ_LOCK,
208	&aio_ex->lock);
209
210	/* Take the lock until the AIO completes. */
211	if (!SMB_VFS_STRICT_LOCK(conn, fsp, &aio_ex->lock)) {
212	TALLOC_FREE(aio_ex);
213	return NT_STATUS_FILE_LOCK_CONFLICT;
214	}
215
216	a = &aio_ex->acb;
217
218	/* Now set up the aio record for the read call. */
219
220	a->aio_fildes = fsp->fh->fd;
221	a->aio_buf = smb_buf(aio_ex->outbuf.data);
222	a->aio_nbytes = smb_maxcnt;
223	a->aio_offset = startpos;
224	a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
225	a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
226	a->aio_sigevent.sigev_value.sival_ptr = aio_ex;
227
228	ret = SMB_VFS_AIO_READ(fsp, a);
229	if (ret == -1) {
230	DEBUG(0,("schedule_aio_read_and_X: aio_read failed. "
231	"Error %s\n", strerror(errno) ));
232	SMB_VFS_STRICT_UNLOCK(conn, fsp, &aio_ex->lock);
233	TALLOC_FREE(aio_ex);
234	return NT_STATUS_RETRY;
235	}
236
237	outstanding_aio_calls++;
238	aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
239
240	DEBUG(10,("schedule_aio_read_and_X: scheduled aio_read for file %s, "
241	"offset %.0f, len = %u (mid = %u)\n",
242	fsp_str_dbg(fsp), (double)startpos, (unsigned int)smb_maxcnt,
243	(unsigned int)aio_ex->smbreq->mid ));
244
245	return NT_STATUS_OK;
246	}
247
248	/****************************************************************************
249	Set up an aio request from a SMBwriteX call.
250	*****************************************************************************/
251
252	NTSTATUS schedule_aio_write_and_X(connection_struct *conn,
253	struct smb_request *smbreq,
254	files_struct fsp, char data,
255	SMB_OFF_T startpos,
256	size_t numtowrite)
257	{
258	struct aio_extra *aio_ex;
259	SMB_STRUCT_AIOCB *a;
260	size_t bufsize;
261	size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
262	int ret;
263
264	/* Ensure aio is initialized. */
265	if (!initialize_async_io_handler()) {
266	return NT_STATUS_RETRY;
267	}
268
269	if (fsp->base_fsp != NULL) {
270	/* No AIO on streams yet */
271	DEBUG(10, ("AIO on streams not yet supported\n"));
272	return NT_STATUS_RETRY;
273	}
274
275	if ((!min_aio_write_size \|\| (numtowrite < min_aio_write_size))
276	&& !SMB_VFS_AIO_FORCE(fsp)) {
277	/* Too small a write for aio request. */
278	DEBUG(10,("schedule_aio_write_and_X: write size (%u) too "
279	"small for minimum aio_write of %u\n",
280	(unsigned int)numtowrite,
281	(unsigned int)min_aio_write_size ));
282	return NT_STATUS_RETRY;
283	}
284
285	/* Only do this on non-chained and non-chaining writes not using the
286	* write cache. */
287	if (req_is_in_chain(smbreq) \|\| (lp_write_cache_size(SNUM(conn)) != 0)) {
288	return NT_STATUS_RETRY;
289	}
290
291	if (outstanding_aio_calls >= aio_pending_size) {
292	DEBUG(3,("schedule_aio_write_and_X: Already have %d aio "
293	"activities outstanding.\n",
294	outstanding_aio_calls ));
295	DEBUG(10,("schedule_aio_write_and_X: failed to schedule "
296	"aio_write for file %s, offset %.0f, len = %u "
297	"(mid = %u)\n",
298	fsp_str_dbg(fsp), (double)startpos,
299	(unsigned int)numtowrite,
300	(unsigned int)smbreq->mid ));
301	return NT_STATUS_RETRY;
302	}
303
304	bufsize = smb_size + 6*2;
305
306	if (!(aio_ex = create_aio_extra(NULL, fsp, bufsize))) {
307	DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n"));
308	return NT_STATUS_NO_MEMORY;
309	}
310	aio_ex->handle_completion = handle_aio_write_complete;
311	aio_ex->write_through = BITSETW(smbreq->vwv+7,0);
312
313	construct_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
314	srv_set_message((char *)aio_ex->outbuf.data, 6, 0, True);
315	SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
316
317	init_strict_lock_struct(fsp, (uint64_t)smbreq->smbpid,
318	(uint64_t)startpos, (uint64_t)numtowrite, WRITE_LOCK,
319	&aio_ex->lock);
320
321	/* Take the lock until the AIO completes. */
322	if (!SMB_VFS_STRICT_LOCK(conn, fsp, &aio_ex->lock)) {
323	TALLOC_FREE(aio_ex);
324	return NT_STATUS_FILE_LOCK_CONFLICT;
325	}
326
327	a = &aio_ex->acb;
328
329	/* Now set up the aio record for the write call. */
330
331	a->aio_fildes = fsp->fh->fd;
332	a->aio_buf = data;
333	a->aio_nbytes = numtowrite;
334	a->aio_offset = startpos;
335	a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
336	a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
337	a->aio_sigevent.sigev_value.sival_ptr = aio_ex;
338
339	ret = SMB_VFS_AIO_WRITE(fsp, a);
340	if (ret == -1) {
341	DEBUG(3,("schedule_aio_wrote_and_X: aio_write failed. "
342	"Error %s\n", strerror(errno) ));
343	SMB_VFS_STRICT_UNLOCK(conn, fsp, &aio_ex->lock);
344	TALLOC_FREE(aio_ex);
345	return NT_STATUS_RETRY;
346	}
347
348	outstanding_aio_calls++;
349	aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
350
351	/* This should actually be improved to span the write. */
352	contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
353	contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
354
355	if (!aio_ex->write_through && !lp_syncalways(SNUM(fsp->conn))
356	&& fsp->aio_write_behind) {
357	/* Lie to the client and immediately claim we finished the
358	* write. */
359	SSVAL(aio_ex->outbuf.data,smb_vwv2,numtowrite);
360	SSVAL(aio_ex->outbuf.data,smb_vwv4,(numtowrite>>16)&1);
361	show_msg((char *)aio_ex->outbuf.data);
362	if (!srv_send_smb(aio_ex->smbreq->sconn,
363	(char *)aio_ex->outbuf.data,
364	true, aio_ex->smbreq->seqnum+1,
365	IS_CONN_ENCRYPTED(fsp->conn),
366	&aio_ex->smbreq->pcd)) {
367	exit_server_cleanly("schedule_aio_write_and_X: "
368	"srv_send_smb failed.");
369	}
370	DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write "
371	"behind for file %s\n", fsp_str_dbg(fsp)));
372	}
373
374	DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write for file "
375	"%s, offset %.0f, len = %u (mid = %u) "
376	"outstanding_aio_calls = %d\n",
377	fsp_str_dbg(fsp), (double)startpos, (unsigned int)numtowrite,
378	(unsigned int)aio_ex->smbreq->mid, outstanding_aio_calls ));
379
380	return NT_STATUS_OK;
381	}
382
383	/****************************************************************************
384	Set up an aio request from a SMB2 read call.
385	*****************************************************************************/
386
387	NTSTATUS schedule_smb2_aio_read(connection_struct *conn,
388	struct smb_request *smbreq,
389	files_struct *fsp,
390	TALLOC_CTX *ctx,
391	DATA_BLOB *preadbuf,
392	SMB_OFF_T startpos,
393	size_t smb_maxcnt)
394	{
395	struct aio_extra *aio_ex;
396	SMB_STRUCT_AIOCB *a;
397	size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
398	int ret;
399
400	/* Ensure aio is initialized. */
401	if (!initialize_async_io_handler()) {
402	return NT_STATUS_RETRY;
403	}
404
405	if (fsp->base_fsp != NULL) {
406	/* No AIO on streams yet */
407	DEBUG(10, ("AIO on streams not yet supported\n"));
408	return NT_STATUS_RETRY;
409	}
410
411	if ((!min_aio_read_size \|\| (smb_maxcnt < min_aio_read_size))
412	&& !SMB_VFS_AIO_FORCE(fsp)) {
413	/* Too small a read for aio request. */
414	DEBUG(10,("smb2: read size (%u) too small "
415	"for minimum aio_read of %u\n",
416	(unsigned int)smb_maxcnt,
417	(unsigned int)min_aio_read_size ));
418	return NT_STATUS_RETRY;
419	}
420
421	/* Only do this on reads not using the write cache. */
422	if (lp_write_cache_size(SNUM(conn)) != 0) {
423	return NT_STATUS_RETRY;
424	}
425
426	if (outstanding_aio_calls >= aio_pending_size) {
427	DEBUG(10,("smb2: Already have %d aio "
428	"activities outstanding.\n",
429	outstanding_aio_calls ));
430	return NT_STATUS_RETRY;
431	}
432
433	/* Create the out buffer. */
434	*preadbuf = data_blob_talloc(ctx, NULL, smb_maxcnt);
435	if (preadbuf->data == NULL) {
436	return NT_STATUS_NO_MEMORY;
437	}
438
439	if (!(aio_ex = create_aio_extra(smbreq->smb2req, fsp, 0))) {
440	return NT_STATUS_NO_MEMORY;
441	}
442	aio_ex->handle_completion = handle_aio_smb2_read_complete;
443
444	init_strict_lock_struct(fsp, (uint64_t)smbreq->smbpid,
445	(uint64_t)startpos, (uint64_t)smb_maxcnt, READ_LOCK,
446	&aio_ex->lock);
447
448	/* Take the lock until the AIO completes. */
449	if (!SMB_VFS_STRICT_LOCK(conn, fsp, &aio_ex->lock)) {
450	TALLOC_FREE(aio_ex);
451	return NT_STATUS_FILE_LOCK_CONFLICT;
452	}
453
454	a = &aio_ex->acb;
455
456	/* Now set up the aio record for the read call. */
457
458	a->aio_fildes = fsp->fh->fd;
459	a->aio_buf = preadbuf->data;
460	a->aio_nbytes = smb_maxcnt;
461	a->aio_offset = startpos;
462	a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
463	a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
464	a->aio_sigevent.sigev_value.sival_ptr = aio_ex;
465
466	ret = SMB_VFS_AIO_READ(fsp, a);
467	if (ret == -1) {
468	DEBUG(0,("smb2: aio_read failed. "
469	"Error %s\n", strerror(errno) ));
470	SMB_VFS_STRICT_UNLOCK(conn, fsp, &aio_ex->lock);
471	TALLOC_FREE(aio_ex);
472	return NT_STATUS_RETRY;
473	}
474
475	outstanding_aio_calls++;
476	/* We don't need talloc_move here as both aio_ex and
477	* smbreq are children of smbreq->smb2req. */
478	aio_ex->smbreq = smbreq;
479
480	DEBUG(10,("smb2: scheduled aio_read for file %s, "
481	"offset %.0f, len = %u (mid = %u)\n",
482	fsp_str_dbg(fsp), (double)startpos, (unsigned int)smb_maxcnt,
483	(unsigned int)aio_ex->smbreq->mid ));
484
485	return NT_STATUS_OK;
486	}
487
488	/****************************************************************************
489	Set up an aio request from a SMB2write call.
490	*****************************************************************************/
491
492	NTSTATUS schedule_aio_smb2_write(connection_struct *conn,
493	struct smb_request *smbreq,
494	files_struct *fsp,
495	uint64_t in_offset,
496	DATA_BLOB in_data,
497	bool write_through)
498	{
499	struct aio_extra *aio_ex = NULL;
500	SMB_STRUCT_AIOCB *a = NULL;
501	size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
502	int ret;
503
504	/* Ensure aio is initialized. */
505	if (!initialize_async_io_handler()) {
506	return NT_STATUS_RETRY;
507	}
508
509	if (fsp->base_fsp != NULL) {
510	/* No AIO on streams yet */
511	DEBUG(10, ("AIO on streams not yet supported\n"));
512	return NT_STATUS_RETRY;
513	}
514
515	if ((!min_aio_write_size \|\| (in_data.length < min_aio_write_size))
516	&& !SMB_VFS_AIO_FORCE(fsp)) {
517	/* Too small a write for aio request. */
518	DEBUG(10,("smb2: write size (%u) too "
519	"small for minimum aio_write of %u\n",
520	(unsigned int)in_data.length,
521	(unsigned int)min_aio_write_size ));
522	return NT_STATUS_RETRY;
523	}
524
525	/* Only do this on writes not using the write cache. */
526	if (lp_write_cache_size(SNUM(conn)) != 0) {
527	return NT_STATUS_RETRY;
528	}
529
530	if (outstanding_aio_calls >= aio_pending_size) {
531	DEBUG(3,("smb2: Already have %d aio "
532	"activities outstanding.\n",
533	outstanding_aio_calls ));
534	return NT_STATUS_RETRY;
535	}
536
537	if (!(aio_ex = create_aio_extra(smbreq->smb2req, fsp, 0))) {
538	return NT_STATUS_NO_MEMORY;
539	}
540
541	aio_ex->handle_completion = handle_aio_smb2_write_complete;
542	aio_ex->write_through = write_through;
543
544	init_strict_lock_struct(fsp, (uint64_t)smbreq->smbpid,
545	in_offset, (uint64_t)in_data.length, WRITE_LOCK,
546	&aio_ex->lock);
547
548	/* Take the lock until the AIO completes. */
549	if (!SMB_VFS_STRICT_LOCK(conn, fsp, &aio_ex->lock)) {
550	TALLOC_FREE(aio_ex);
551	return NT_STATUS_FILE_LOCK_CONFLICT;
552	}
553
554	a = &aio_ex->acb;
555
556	/* Now set up the aio record for the write call. */
557
558	a->aio_fildes = fsp->fh->fd;
559	a->aio_buf = in_data.data;
560	a->aio_nbytes = in_data.length;
561	a->aio_offset = in_offset;
562	a->aio_sigevent.sigev_notify = SIGEV_SIGNAL;
563	a->aio_sigevent.sigev_signo = RT_SIGNAL_AIO;
564	a->aio_sigevent.sigev_value.sival_ptr = aio_ex;
565
566	ret = SMB_VFS_AIO_WRITE(fsp, a);
567	if (ret == -1) {
568	DEBUG(3,("smb2: aio_write failed. "
569	"Error %s\n", strerror(errno) ));
570	SMB_VFS_STRICT_UNLOCK(conn, fsp, &aio_ex->lock);
571	TALLOC_FREE(aio_ex);
572	return NT_STATUS_RETRY;
573	}
574
575	outstanding_aio_calls++;
576	/* We don't need talloc_move here as both aio_ex and
577	* smbreq are children of smbreq->smb2req. */
578	aio_ex->smbreq = smbreq;
579
580	/* This should actually be improved to span the write. */
581	contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
582	contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
583
584	/*
585	* We don't want to do write behind due to ownership
586	* issues of the request structs. Maybe add it if I
587	* figure those out. JRA.
588	*/
589
590	DEBUG(10,("smb2: scheduled aio_write for file "
591	"%s, offset %.0f, len = %u (mid = %u) "
592	"outstanding_aio_calls = %d\n",
593	fsp_str_dbg(fsp),
594	(double)in_offset,
595	(unsigned int)in_data.length,
596	(unsigned int)aio_ex->smbreq->mid,
597	outstanding_aio_calls ));
598
599	return NT_STATUS_OK;
600	}
601
602	/****************************************************************************
603	Complete the read and return the data or error back to the client.
604	Returns errno or zero if all ok.
605	*****************************************************************************/
606
607	static int handle_aio_read_complete(struct aio_extra *aio_ex, int errcode)
608	{
609	int outsize;
610	char outbuf = (char )aio_ex->outbuf.data;
611	char *data = smb_buf(outbuf);
612	ssize_t nread = SMB_VFS_AIO_RETURN(aio_ex->fsp,&aio_ex->acb);
613
614	if (nread < 0) {
615	/* We're relying here on the fact that if the fd is
616	closed then the aio will complete and aio_return
617	will return an error. Hopefully this is
618	true.... JRA. */
619
620	DEBUG( 3,( "handle_aio_read_complete: file %s nread == %d. "
621	"Error = %s\n",
622	fsp_str_dbg(aio_ex->fsp), (int)nread, strerror(errcode)));
623
624	ERROR_NT(map_nt_error_from_unix(errcode));
625	outsize = srv_set_message(outbuf,0,0,true);
626	} else {
627	outsize = srv_set_message(outbuf,12,nread,False);
628	SSVAL(outbuf,smb_vwv2,0xFFFF); /* Remaining - must be * -1. */
629	SSVAL(outbuf,smb_vwv5,nread);
630	SSVAL(outbuf,smb_vwv6,smb_offset(data,outbuf));
631	SSVAL(outbuf,smb_vwv7,((nread >> 16) & 1));
632	SSVAL(smb_buf(outbuf),-2,nread);
633
634	aio_ex->fsp->fh->pos = aio_ex->acb.aio_offset + nread;
635	aio_ex->fsp->fh->position_information = aio_ex->fsp->fh->pos;
636
637	DEBUG( 3, ( "handle_aio_read_complete file %s max=%d "
638	"nread=%d\n",
639	fsp_str_dbg(aio_ex->fsp),
640	(int)aio_ex->acb.aio_nbytes, (int)nread ) );
641
642	}
643	smb_setlen(outbuf,outsize - 4);
644	show_msg(outbuf);
645	if (!srv_send_smb(aio_ex->smbreq->sconn, outbuf,
646	true, aio_ex->smbreq->seqnum+1,
647	IS_CONN_ENCRYPTED(aio_ex->fsp->conn), NULL)) {
648	exit_server_cleanly("handle_aio_read_complete: srv_send_smb "
649	"failed.");
650	}
651
652	DEBUG(10,("handle_aio_read_complete: scheduled aio_read completed "
653	"for file %s, offset %.0f, len = %u\n",
654	fsp_str_dbg(aio_ex->fsp), (double)aio_ex->acb.aio_offset,
655	(unsigned int)nread ));
656
657	return errcode;
658	}
659
660	/****************************************************************************
661	Complete the write and return the data or error back to the client.
662	Returns error code or zero if all ok.
663	*****************************************************************************/
664
665	static int handle_aio_write_complete(struct aio_extra *aio_ex, int errcode)
666	{
667	files_struct *fsp = aio_ex->fsp;
668	char outbuf = (char )aio_ex->outbuf.data;
669	ssize_t numtowrite = aio_ex->acb.aio_nbytes;
670	ssize_t nwritten = SMB_VFS_AIO_RETURN(fsp,&aio_ex->acb);
671
672	if (fsp->aio_write_behind) {
673	if (nwritten != numtowrite) {
674	if (nwritten == -1) {
675	DEBUG(5,("handle_aio_write_complete: "
676	"aio_write_behind failed ! File %s "
677	"is corrupt ! Error %s\n",
678	fsp_str_dbg(fsp), strerror(errcode)));
679	} else {
680	DEBUG(0,("handle_aio_write_complete: "
681	"aio_write_behind failed ! File %s "
682	"is corrupt ! Wanted %u bytes but "
683	"only wrote %d\n", fsp_str_dbg(fsp),
684	(unsigned int)numtowrite,
685	(int)nwritten ));
686	errcode = EIO;
687	}
688	} else {
689	DEBUG(10,("handle_aio_write_complete: "
690	"aio_write_behind completed for file %s\n",
691	fsp_str_dbg(fsp)));
692	}
693	/* TODO: should no return 0 in case of an error !!! */
694	return 0;
695	}
696
697	/* We don't need outsize or set_message here as we've already set the
698	fixed size length when we set up the aio call. */
699
700	if(nwritten == -1) {
701	DEBUG( 3,( "handle_aio_write: file %s wanted %u bytes. "
702	"nwritten == %d. Error = %s\n",
703	fsp_str_dbg(fsp), (unsigned int)numtowrite,
704	(int)nwritten, strerror(errcode) ));
705
706	ERROR_NT(map_nt_error_from_unix(errcode));
707	srv_set_message(outbuf,0,0,true);
708	} else {
709	NTSTATUS status;
710
711	SSVAL(outbuf,smb_vwv2,nwritten);
712	SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1);
713	if (nwritten < (ssize_t)numtowrite) {
714	SCVAL(outbuf,smb_rcls,ERRHRD);
715	SSVAL(outbuf,smb_err,ERRdiskfull);
716	}
717
718	DEBUG(3,("handle_aio_write: fnum=%d num=%d wrote=%d\n",
719	fsp->fnum, (int)numtowrite, (int)nwritten));
720	status = sync_file(fsp->conn,fsp, aio_ex->write_through);
721	if (!NT_STATUS_IS_OK(status)) {
722	errcode = errno;
723	ERROR_BOTH(map_nt_error_from_unix(errcode),
724	ERRHRD, ERRdiskfull);
725	srv_set_message(outbuf,0,0,true);
726	DEBUG(5,("handle_aio_write: sync_file for %s returned %s\n",
727	fsp_str_dbg(fsp), nt_errstr(status)));
728	}
729
730	aio_ex->fsp->fh->pos = aio_ex->acb.aio_offset + nwritten;
731	}
732
733	show_msg(outbuf);
734	if (!srv_send_smb(aio_ex->smbreq->sconn, outbuf,
735	true, aio_ex->smbreq->seqnum+1,
736	IS_CONN_ENCRYPTED(fsp->conn),
737	NULL)) {
738	exit_server_cleanly("handle_aio_write_complete: "
739	"srv_send_smb failed.");
740	}
741
742	DEBUG(10,("handle_aio_write_complete: scheduled aio_write completed "
743	"for file %s, offset %.0f, requested %u, written = %u\n",
744	fsp_str_dbg(fsp), (double)aio_ex->acb.aio_offset,
745	(unsigned int)numtowrite, (unsigned int)nwritten ));
746
747	return errcode;
748	}
749
750	/****************************************************************************
751	Complete the read and return the data or error back to the client.
752	Returns errno or zero if all ok.
753	*****************************************************************************/
754
755	static int handle_aio_smb2_read_complete(struct aio_extra *aio_ex, int errcode)
756	{
757	NTSTATUS status;
758	struct tevent_req *subreq = aio_ex->smbreq->smb2req->subreq;
759	ssize_t nread = SMB_VFS_AIO_RETURN(aio_ex->fsp,&aio_ex->acb);
760
761	/* Common error or success code processing for async or sync
762	read returns. */
763
764	status = smb2_read_complete(subreq, nread, errcode);
765
766	if (nread > 0) {
767	aio_ex->fsp->fh->pos = aio_ex->acb.aio_offset + nread;
768	aio_ex->fsp->fh->position_information = aio_ex->fsp->fh->pos;
769	}
770
771	DEBUG(10,("smb2: scheduled aio_read completed "
772	"for file %s, offset %.0f, len = %u "
773	"(errcode = %d, NTSTATUS = %s)\n",
774	fsp_str_dbg(aio_ex->fsp),
775	(double)aio_ex->acb.aio_offset,
776	(unsigned int)nread,
777	errcode,
778	nt_errstr(status) ));
779
780	if (!NT_STATUS_IS_OK(status)) {
781	tevent_req_nterror(subreq, status);
782	return errcode;
783	}
784
785	tevent_req_done(subreq);
786	return errcode;
787	}
788
789	/****************************************************************************
790	Complete the SMB2 write and return the data or error back to the client.
791	Returns error code or zero if all ok.
792	*****************************************************************************/
793
794	static int handle_aio_smb2_write_complete(struct aio_extra *aio_ex, int errcode)
795	{
796	files_struct *fsp = aio_ex->fsp;
797	ssize_t numtowrite = aio_ex->acb.aio_nbytes;
798	ssize_t nwritten = SMB_VFS_AIO_RETURN(fsp,&aio_ex->acb);
799	struct tevent_req *subreq = aio_ex->smbreq->smb2req->subreq;
800	NTSTATUS status;
801
802	status = smb2_write_complete(subreq, nwritten, errcode);
803
804	DEBUG(10,("smb2: scheduled aio_write completed "
805	"for file %s, offset %.0f, requested %u, "
806	"written = %u (errcode = %d, NTSTATUS = %s)\n",
807	fsp_str_dbg(fsp),
808	(double)aio_ex->acb.aio_offset,
809	(unsigned int)numtowrite,
810	(unsigned int)nwritten,
811	errcode,
812	nt_errstr(status) ));
813
814	if (!NT_STATUS_IS_OK(status)) {
815	tevent_req_nterror(subreq, status);
816	return errcode;
817	}
818
819	tevent_req_done(subreq);
820	return errcode;
821	}
822
823	/****************************************************************************
824	Handle any aio completion. Returns True if finished (and sets *perr if err
825	was non-zero), False if not.
826	*****************************************************************************/
827
828	static bool handle_aio_completed(struct aio_extra aio_ex, int perr)
829	{
830	files_struct *fsp = NULL;
831	int err;
832
833	if(!aio_ex) {
834	DEBUG(3, ("handle_aio_completed: Non-existing aio_ex passed\n"));
835	return false;
836	}
837
838	fsp = aio_ex->fsp;
839
840	/* Ensure the operation has really completed. */
841	err = SMB_VFS_AIO_ERROR(fsp, &aio_ex->acb);
842	if (err == EINPROGRESS) {
843	DEBUG(10,( "handle_aio_completed: operation mid %llu still in "
844	"process for file %s\n",
845	(unsigned long long)aio_ex->smbreq->mid,
846	fsp_str_dbg(aio_ex->fsp)));
847	return False;
848	}
849
850	/* Unlock now we're done. */
851	SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &aio_ex->lock);
852
853	if (err == ECANCELED) {
854	/* If error is ECANCELED then don't return anything to the
855	* client. */
856	DEBUG(10,( "handle_aio_completed: operation mid %llu"
857	" canceled\n",
858	(unsigned long long)aio_ex->smbreq->mid));
859	return True;
860	}
861
862	err = aio_ex->handle_completion(aio_ex, err);
863	if (err) {
864	perr = err; / Only save non-zero errors. */
865	}
866
867	return True;
868	}
869
870	/****************************************************************************
871	Handle any aio completion inline.
872	*****************************************************************************/
873
874	void smbd_aio_complete_aio_ex(struct aio_extra *aio_ex)
875	{
876	files_struct *fsp = NULL;
877	int ret = 0;
878
879	outstanding_aio_calls--;
880
881	DEBUG(10,("smbd_aio_complete_mid: mid[%llu]\n",
882	(unsigned long long)aio_ex->smbreq->mid));
883
884	fsp = aio_ex->fsp;
885	if (fsp == NULL) {
886	/* file was closed whilst I/O was outstanding. Just
887	* ignore. */
888	DEBUG( 3,( "smbd_aio_complete_mid: file closed whilst "
889	"aio outstanding (mid[%llu]).\n",
890	(unsigned long long)aio_ex->smbreq->mid));
891	return;
892	}
893
894	if (!handle_aio_completed(aio_ex, &ret)) {
895	return;
896	}
897
898	TALLOC_FREE(aio_ex);
899	}
900
901	/****************************************************************************
902	We're doing write behind and the client closed the file. Wait up to 30
903	seconds (my arbitrary choice) for the aio to complete. Return 0 if all writes
904	completed, errno to return if not.
905	*****************************************************************************/
906
907	#define SMB_TIME_FOR_AIO_COMPLETE_WAIT 29
908
909	int wait_for_aio_completion(files_struct *fsp)
910	{
911	struct aio_extra *aio_ex;
912	const SMB_STRUCT_AIOCB **aiocb_list;
913	int aio_completion_count = 0;
914	time_t start_time = time_mono(NULL);
915	int seconds_left;
916
917	for (seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT;
918	seconds_left >= 0;) {
919	int err = 0;
920	int i;
921	struct timespec ts;
922
923	aio_completion_count = 0;
924	for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) {
925	if (aio_ex->fsp == fsp) {
926	aio_completion_count++;
927	}
928	}
929
930	if (!aio_completion_count) {
931	return 0;
932	}
933
934	DEBUG(3,("wait_for_aio_completion: waiting for %d aio events "
935	"to complete.\n", aio_completion_count ));
936
937	aiocb_list = SMB_MALLOC_ARRAY(const SMB_STRUCT_AIOCB *,
938	aio_completion_count);
939	if (!aiocb_list) {
940	return ENOMEM;
941	}
942
943	for( i = 0, aio_ex = aio_list_head;
944	aio_ex;
945	aio_ex = aio_ex->next) {
946	if (aio_ex->fsp == fsp) {
947	aiocb_list[i++] = &aio_ex->acb;
948	}
949	}
950
951	/* Now wait up to seconds_left for completion. */
952	ts.tv_sec = seconds_left;
953	ts.tv_nsec = 0;
954
955	DEBUG(10,("wait_for_aio_completion: %d events, doing a wait "
956	"of %d seconds.\n",
957	aio_completion_count, seconds_left ));
958
959	err = SMB_VFS_AIO_SUSPEND(fsp, aiocb_list,
960	aio_completion_count, &ts);
961
962	DEBUG(10,("wait_for_aio_completion: returned err = %d, "
963	"errno = %s\n", err, strerror(errno) ));
964
965	if (err == -1 && errno == EAGAIN) {
966	DEBUG(0,("wait_for_aio_completion: aio_suspend timed "
967	"out waiting for %d events after a wait of "
968	"%d seconds\n", aio_completion_count,
969	seconds_left));
970	/* Timeout. */
971	cancel_aio_by_fsp(fsp);
972	SAFE_FREE(aiocb_list);
973	return EIO;
974	}
975
976	/* One or more events might have completed - process them if
977	* so. */
978	for( i = 0; i < aio_completion_count; i++) {
979	aio_ex = (struct aio_extra *)aiocb_list[i]->aio_sigevent.sigev_value.sival_ptr;
980
981	if (!handle_aio_completed(aio_ex, &err)) {
982	continue;
983	}
984	TALLOC_FREE(aio_ex);
985	}
986
987	SAFE_FREE(aiocb_list);
988	seconds_left = SMB_TIME_FOR_AIO_COMPLETE_WAIT
989	- (time_mono(NULL) - start_time);
990	}
991
992	/* We timed out - we don't know why. Return ret if already an error,
993	* else EIO. */
994	DEBUG(10,("wait_for_aio_completion: aio_suspend timed out waiting "
995	"for %d events\n",
996	aio_completion_count));
997
998	return EIO;
999	}
1000
1001	/****************************************************************************
1002	Cancel any outstanding aio requests. The client doesn't care about the reply.
1003	*****************************************************************************/
1004
1005	void cancel_aio_by_fsp(files_struct *fsp)
1006	{
1007	struct aio_extra *aio_ex;
1008
1009	for( aio_ex = aio_list_head; aio_ex; aio_ex = aio_ex->next) {
1010	if (aio_ex->fsp == fsp) {
1011	/* Unlock now we're done. */
1012	SMB_VFS_STRICT_UNLOCK(fsp->conn, fsp, &aio_ex->lock);
1013
1014	/* Don't delete the aio_extra record as we may have
1015	completed and don't yet know it. Just do the
1016	aio_cancel call and return. */
1017	SMB_VFS_AIO_CANCEL(fsp, &aio_ex->acb);
1018	aio_ex->fsp = NULL; /* fsp will be closed when we
1019	* return. */
1020	}
1021	}
1022	}
1023
1024	#else
1025	NTSTATUS schedule_aio_read_and_X(connection_struct *conn,
1026	struct smb_request *smbreq,
1027	files_struct *fsp, SMB_OFF_T startpos,
1028	size_t smb_maxcnt)
1029	{
1030	return NT_STATUS_RETRY;
1031	}
1032
1033	NTSTATUS schedule_aio_write_and_X(connection_struct *conn,
1034	struct smb_request *smbreq,
1035	files_struct fsp, char data,
1036	SMB_OFF_T startpos,
1037	size_t numtowrite)
1038	{
1039	return NT_STATUS_RETRY;
1040	}
1041
1042	NTSTATUS schedule_smb2_aio_read(connection_struct *conn,
1043	struct smb_request *smbreq,
1044	files_struct *fsp,
1045	TALLOC_CTX *ctx,
1046	DATA_BLOB *preadbuf,
1047	SMB_OFF_T startpos,
1048	size_t smb_maxcnt)
1049	{
1050	return NT_STATUS_RETRY;
1051	}
1052
1053	NTSTATUS schedule_aio_smb2_write(connection_struct *conn,
1054	struct smb_request *smbreq,
1055	files_struct *fsp,
1056	uint64_t in_offset,
1057	DATA_BLOB in_data,
1058	bool write_through)
1059	{
1060	return NT_STATUS_RETRY;
1061	}
1062
1063	void cancel_aio_by_fsp(files_struct *fsp)
1064	{
1065	}
1066
1067	int wait_for_aio_completion(files_struct *fsp)
1068	{
1069	return 0;
1070	}
1071
1072	void smbd_aio_complete_mid(uint64_t mid);
1073
1074	#endif

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