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s4/selftest: Enable samba.tests.samba_tool.join for py3
[Samba.git] / source3 / smbd / aio.c
blobc066ea1a97886fcb9695540aa0cc495486c5a7ff
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 #include "../lib/util/tevent_unix.h"
26 #include "lib/tevent_wait.h"
27
28 /****************************************************************************
29 The buffer we keep around whilst an aio request is in process.
30 *****************************************************************************/
31
32 struct aio_extra {
33 files_struct *fsp;
34 struct smb_request *smbreq;
35 DATA_BLOB outbuf;
36 struct lock_struct lock;
37 size_t nbyte;
38 off_t offset;
39 bool write_through;
40 };
41
42 /****************************************************************************
43 Accessor function to return write_through state.
44 *****************************************************************************/
45
46 bool aio_write_through_requested(struct aio_extra *aio_ex)
47 {
48 return aio_ex->write_through;
49 }
50
51 /****************************************************************************
52 Create the extended aio struct we must keep around for the lifetime
53 of the aio call.
54 *****************************************************************************/
55
56 static struct aio_extra *create_aio_extra(TALLOC_CTX *mem_ctx,
57 files_struct *fsp,
58 size_t buflen)
59 {
60 struct aio_extra *aio_ex = talloc_zero(mem_ctx, struct aio_extra);
61
62 if (!aio_ex) {
63 return NULL;
64 }
65
66 /* The output buffer stored in the aio_ex is the start of
67 the smb return buffer. The buffer used in the acb
68 is the start of the reply data portion of that buffer. */
69
70 if (buflen) {
71 aio_ex->outbuf = data_blob_talloc(aio_ex, NULL, buflen);
72 if (!aio_ex->outbuf.data) {
73 TALLOC_FREE(aio_ex);
74 return NULL;
75 }
76 }
77 aio_ex->fsp = fsp;
78 return aio_ex;
79 }
80
81 struct aio_req_fsp_link {
82 files_struct *fsp;
83 struct tevent_req *req;
84 };
85
86 static int aio_del_req_from_fsp(struct aio_req_fsp_link *lnk)
87 {
88 unsigned i;
89 files_struct *fsp = lnk->fsp;
90 struct tevent_req *req = lnk->req;
91
92 for (i=0; i<fsp->num_aio_requests; i++) {
93 if (fsp->aio_requests[i] == req) {
94 break;
95 }
96 }
97 if (i == fsp->num_aio_requests) {
98 DEBUG(1, ("req %p not found in fsp %p\n", req, fsp));
99 return 0;
100 }
101 fsp->num_aio_requests -= 1;
102 fsp->aio_requests[i] = fsp->aio_requests[fsp->num_aio_requests];
103
104 if (fsp->num_aio_requests == 0) {
105 tevent_wait_done(fsp->deferred_close);
106 }
107 return 0;
108 }
109
110 bool aio_add_req_to_fsp(files_struct *fsp, struct tevent_req *req)
111 {
112 size_t array_len;
113 struct aio_req_fsp_link *lnk;
114
115 lnk = talloc(req, struct aio_req_fsp_link);
116 if (lnk == NULL) {
117 return false;
118 }
119
120 array_len = talloc_array_length(fsp->aio_requests);
121 if (array_len <= fsp->num_aio_requests) {
122 struct tevent_req **tmp;
123
124 tmp = talloc_realloc(
125 fsp, fsp->aio_requests, struct tevent_req *,
126 fsp->num_aio_requests+1);
127 if (tmp == NULL) {
128 TALLOC_FREE(lnk);
129 return false;
130 }
131 fsp->aio_requests = tmp;
132 }
133 fsp->aio_requests[fsp->num_aio_requests] = req;
134 fsp->num_aio_requests += 1;
135
136 lnk->fsp = fsp;
137 lnk->req = req;
138 talloc_set_destructor(lnk, aio_del_req_from_fsp);
139
140 return true;
141 }
142
143 static void aio_pread_smb1_done(struct tevent_req *req);
144
145 /****************************************************************************
146 Set up an aio request from a SMBreadX call.
147 *****************************************************************************/
148
149 NTSTATUS schedule_aio_read_and_X(connection_struct *conn,
150 struct smb_request *smbreq,
151 files_struct *fsp, off_t startpos,
152 size_t smb_maxcnt)
153 {
154 struct aio_extra *aio_ex;
155 size_t bufsize;
156 size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
157 struct tevent_req *req;
158
159 if (fsp->base_fsp != NULL) {
160 /* No AIO on streams yet */
161 DEBUG(10, ("AIO on streams not yet supported\n"));
162 return NT_STATUS_RETRY;
163 }
164
165 if ((!min_aio_read_size || (smb_maxcnt < min_aio_read_size))
166 && !SMB_VFS_AIO_FORCE(fsp)) {
167 /* Too small a read for aio request. */
168 DEBUG(10,("schedule_aio_read_and_X: read size (%u) too small "
169 "for minimum aio_read of %u\n",
170 (unsigned int)smb_maxcnt,
171 (unsigned int)min_aio_read_size ));
172 return NT_STATUS_RETRY;
173 }
174
175 /* Only do this on non-chained and non-chaining reads not using the
176 * write cache. */
177 if (req_is_in_chain(smbreq) || (lp_write_cache_size(SNUM(conn)) != 0)) {
178 return NT_STATUS_RETRY;
179 }
180
181 /* The following is safe from integer wrap as we've already checked
182 smb_maxcnt is 128k or less. Wct is 12 for read replies */
183
184 bufsize = smb_size + 12 * 2 + smb_maxcnt + 1 /* padding byte */;
185
186 if ((aio_ex = create_aio_extra(NULL, fsp, bufsize)) == NULL) {
187 DEBUG(10,("schedule_aio_read_and_X: malloc fail.\n"));
188 return NT_STATUS_NO_MEMORY;
189 }
190
191 construct_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
192 srv_set_message((char *)aio_ex->outbuf.data, 12, 0, True);
193 SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
194 SCVAL(smb_buf(aio_ex->outbuf.data), 0, 0); /* padding byte */
195
196 init_strict_lock_struct(fsp, (uint64_t)smbreq->smbpid,
197 (uint64_t)startpos, (uint64_t)smb_maxcnt, READ_LOCK,
198 &aio_ex->lock);
199
200 /* Take the lock until the AIO completes. */
201 if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &aio_ex->lock)) {
202 TALLOC_FREE(aio_ex);
203 return NT_STATUS_FILE_LOCK_CONFLICT;
204 }
205
206 aio_ex->nbyte = smb_maxcnt;
207 aio_ex->offset = startpos;
208
209 req = SMB_VFS_PREAD_SEND(aio_ex, smbreq->ev_ctx,
210 fsp,
211 smb_buf(aio_ex->outbuf.data) + 1 /* pad */,
212 smb_maxcnt, startpos);
213 if (req == NULL) {
214 DEBUG(0,("schedule_aio_read_and_X: aio_read failed. "
215 "Error %s\n", strerror(errno) ));
216 TALLOC_FREE(aio_ex);
217 return NT_STATUS_RETRY;
218 }
219 tevent_req_set_callback(req, aio_pread_smb1_done, aio_ex);
220
221 if (!aio_add_req_to_fsp(fsp, req)) {
222 DEBUG(1, ("Could not add req to fsp\n"));
223 TALLOC_FREE(aio_ex);
224 return NT_STATUS_RETRY;
225 }
226
227 aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
228
229 DEBUG(10,("schedule_aio_read_and_X: scheduled aio_read for file %s, "
230 "offset %.0f, len = %u (mid = %u)\n",
231 fsp_str_dbg(fsp), (double)startpos, (unsigned int)smb_maxcnt,
232 (unsigned int)aio_ex->smbreq->mid ));
233
234 return NT_STATUS_OK;
235 }
236
237 static void aio_pread_smb1_done(struct tevent_req *req)
238 {
239 struct aio_extra *aio_ex = tevent_req_callback_data(
240 req, struct aio_extra);
241 files_struct *fsp = aio_ex->fsp;
242 size_t outsize;
243 char *outbuf = (char *)aio_ex->outbuf.data;
244 ssize_t nread;
245 struct vfs_aio_state vfs_aio_state;
246
247 nread = SMB_VFS_PREAD_RECV(req, &vfs_aio_state);
248 TALLOC_FREE(req);
249
250 DEBUG(10, ("pread_recv returned %d, err = %s\n", (int)nread,
251 (nread == -1) ? strerror(vfs_aio_state.error) : "no error"));
252
253 if (fsp == NULL) {
254 DEBUG( 3, ("aio_pread_smb1_done: file closed whilst "
255 "aio outstanding (mid[%llu]).\n",
256 (unsigned long long)aio_ex->smbreq->mid));
257 TALLOC_FREE(aio_ex);
258 return;
259 }
260
261 if (nread < 0) {
262 DEBUG( 3, ("handle_aio_read_complete: file %s nread == %d. "
263 "Error = %s\n", fsp_str_dbg(fsp), (int)nread,
264 strerror(vfs_aio_state.error)));
265
266 ERROR_NT(map_nt_error_from_unix(vfs_aio_state.error));
267 outsize = srv_set_message(outbuf,0,0,true);
268 } else {
269 outsize = setup_readX_header(outbuf, nread);
270
271 aio_ex->fsp->fh->pos = aio_ex->offset + nread;
272 aio_ex->fsp->fh->position_information = aio_ex->fsp->fh->pos;
273
274 DEBUG( 3, ("handle_aio_read_complete file %s max=%d "
275 "nread=%d\n", fsp_str_dbg(fsp),
276 (int)aio_ex->nbyte, (int)nread ) );
277
278 }
279
280 if (outsize <= 4) {
281 DBG_INFO("Invalid outsize (%zu)\n", outsize);
282 TALLOC_FREE(aio_ex);
283 return;
284 }
285 outsize -= 4;
286 _smb_setlen_large(outbuf, outsize);
287
288 show_msg(outbuf);
289 if (!srv_send_smb(aio_ex->smbreq->xconn, outbuf,
290 true, aio_ex->smbreq->seqnum+1,
291 IS_CONN_ENCRYPTED(fsp->conn), NULL)) {
292 exit_server_cleanly("handle_aio_read_complete: srv_send_smb "
293 "failed.");
294 }
295
296 DEBUG(10, ("handle_aio_read_complete: scheduled aio_read completed "
297 "for file %s, offset %.0f, len = %u\n",
298 fsp_str_dbg(fsp), (double)aio_ex->offset,
299 (unsigned int)nread));
300
301 TALLOC_FREE(aio_ex);
302 }
303
304 struct pwrite_fsync_state {
305 struct tevent_context *ev;
306 files_struct *fsp;
307 bool write_through;
308 ssize_t nwritten;
309 };
310
311 static void pwrite_fsync_write_done(struct tevent_req *subreq);
312 static void pwrite_fsync_sync_done(struct tevent_req *subreq);
313
314 static struct tevent_req *pwrite_fsync_send(TALLOC_CTX *mem_ctx,
315 struct tevent_context *ev,
316 struct files_struct *fsp,
317 const void *data,
318 size_t n, off_t offset,
319 bool write_through)
320 {
321 struct tevent_req *req, *subreq;
322 struct pwrite_fsync_state *state;
323
324 req = tevent_req_create(mem_ctx, &state, struct pwrite_fsync_state);
325 if (req == NULL) {
326 return NULL;
327 }
328 state->ev = ev;
329 state->fsp = fsp;
330 state->write_through = write_through;
331
332 subreq = SMB_VFS_PWRITE_SEND(state, ev, fsp, data, n, offset);
333 if (tevent_req_nomem(subreq, req)) {
334 return tevent_req_post(req, ev);
335 }
336 tevent_req_set_callback(subreq, pwrite_fsync_write_done, req);
337 return req;
338 }
339
340 static void pwrite_fsync_write_done(struct tevent_req *subreq)
341 {
342 struct tevent_req *req = tevent_req_callback_data(
343 subreq, struct tevent_req);
344 struct pwrite_fsync_state *state = tevent_req_data(
345 req, struct pwrite_fsync_state);
346 connection_struct *conn = state->fsp->conn;
347 bool do_sync;
348 struct vfs_aio_state vfs_aio_state;
349
350 state->nwritten = SMB_VFS_PWRITE_RECV(subreq, &vfs_aio_state);
351 TALLOC_FREE(subreq);
352 if (state->nwritten == -1) {
353 tevent_req_error(req, vfs_aio_state.error);
354 return;
355 }
356
357 do_sync = (lp_strict_sync(SNUM(conn)) &&
358 (lp_sync_always(SNUM(conn)) || state->write_through));
359 if (!do_sync) {
360 tevent_req_done(req);
361 return;
362 }
363
364 subreq = SMB_VFS_FSYNC_SEND(state, state->ev, state->fsp);
365 if (tevent_req_nomem(subreq, req)) {
366 return;
367 }
368 tevent_req_set_callback(subreq, pwrite_fsync_sync_done, req);
369 }
370
371 static void pwrite_fsync_sync_done(struct tevent_req *subreq)
372 {
373 struct tevent_req *req = tevent_req_callback_data(
374 subreq, struct tevent_req);
375 int ret;
376 struct vfs_aio_state vfs_aio_state;
377
378 ret = SMB_VFS_FSYNC_RECV(subreq, &vfs_aio_state);
379 TALLOC_FREE(subreq);
380 if (ret == -1) {
381 tevent_req_error(req, vfs_aio_state.error);
382 return;
383 }
384 tevent_req_done(req);
385 }
386
387 static ssize_t pwrite_fsync_recv(struct tevent_req *req, int *perr)
388 {
389 struct pwrite_fsync_state *state = tevent_req_data(
390 req, struct pwrite_fsync_state);
391
392 if (tevent_req_is_unix_error(req, perr)) {
393 return -1;
394 }
395 return state->nwritten;
396 }
397
398 static void aio_pwrite_smb1_done(struct tevent_req *req);
399
400 /****************************************************************************
401 Set up an aio request from a SMBwriteX call.
402 *****************************************************************************/
403
404 NTSTATUS schedule_aio_write_and_X(connection_struct *conn,
405 struct smb_request *smbreq,
406 files_struct *fsp, const char *data,
407 off_t startpos,
408 size_t numtowrite)
409 {
410 struct aio_extra *aio_ex;
411 size_t bufsize;
412 size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
413 struct tevent_req *req;
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_write_size || (numtowrite < min_aio_write_size))
422 && !SMB_VFS_AIO_FORCE(fsp)) {
423 /* Too small a write for aio request. */
424 DEBUG(10,("schedule_aio_write_and_X: write size (%u) too "
425 "small for minimum aio_write of %u\n",
426 (unsigned int)numtowrite,
427 (unsigned int)min_aio_write_size ));
428 return NT_STATUS_RETRY;
429 }
430
431 /* Only do this on non-chained and non-chaining writes not using the
432 * write cache. */
433 if (req_is_in_chain(smbreq) || (lp_write_cache_size(SNUM(conn)) != 0)) {
434 return NT_STATUS_RETRY;
435 }
436
437 bufsize = smb_size + 6*2;
438
439 if (!(aio_ex = create_aio_extra(NULL, fsp, bufsize))) {
440 DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n"));
441 return NT_STATUS_NO_MEMORY;
442 }
443 aio_ex->write_through = BITSETW(smbreq->vwv+7,0);
444
445 construct_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
446 srv_set_message((char *)aio_ex->outbuf.data, 6, 0, True);
447 SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
448
449 init_strict_lock_struct(fsp, (uint64_t)smbreq->smbpid,
450 (uint64_t)startpos, (uint64_t)numtowrite, WRITE_LOCK,
451 &aio_ex->lock);
452
453 /* Take the lock until the AIO completes. */
454 if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &aio_ex->lock)) {
455 TALLOC_FREE(aio_ex);
456 return NT_STATUS_FILE_LOCK_CONFLICT;
457 }
458
459 aio_ex->nbyte = numtowrite;
460 aio_ex->offset = startpos;
461
462 req = pwrite_fsync_send(aio_ex, smbreq->ev_ctx, fsp,
463 data, numtowrite, startpos,
464 aio_ex->write_through);
465 if (req == NULL) {
466 DEBUG(3,("schedule_aio_wrote_and_X: aio_write failed. "
467 "Error %s\n", strerror(errno) ));
468 TALLOC_FREE(aio_ex);
469 return NT_STATUS_RETRY;
470 }
471 tevent_req_set_callback(req, aio_pwrite_smb1_done, aio_ex);
472
473 if (!aio_add_req_to_fsp(fsp, req)) {
474 DEBUG(1, ("Could not add req to fsp\n"));
475 TALLOC_FREE(aio_ex);
476 return NT_STATUS_RETRY;
477 }
478
479 aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
480
481 /* This should actually be improved to span the write. */
482 contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
483 contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
484
485 if (!aio_ex->write_through && !lp_sync_always(SNUM(fsp->conn))
486 && fsp->aio_write_behind) {
487 /* Lie to the client and immediately claim we finished the
488 * write. */
489 SSVAL(aio_ex->outbuf.data,smb_vwv2,numtowrite);
490 SSVAL(aio_ex->outbuf.data,smb_vwv4,(numtowrite>>16)&1);
491 show_msg((char *)aio_ex->outbuf.data);
492 if (!srv_send_smb(aio_ex->smbreq->xconn,
493 (char *)aio_ex->outbuf.data,
494 true, aio_ex->smbreq->seqnum+1,
495 IS_CONN_ENCRYPTED(fsp->conn),
496 &aio_ex->smbreq->pcd)) {
497 exit_server_cleanly("schedule_aio_write_and_X: "
498 "srv_send_smb failed.");
499 }
500 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write "
501 "behind for file %s\n", fsp_str_dbg(fsp)));
502 }
503
504 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write for file "
505 "%s, offset %.0f, len = %u (mid = %u)\n",
506 fsp_str_dbg(fsp), (double)startpos, (unsigned int)numtowrite,
507 (unsigned int)aio_ex->smbreq->mid));
508
509 return NT_STATUS_OK;
510 }
511
512 static void aio_pwrite_smb1_done(struct tevent_req *req)
513 {
514 struct aio_extra *aio_ex = tevent_req_callback_data(
515 req, struct aio_extra);
516 files_struct *fsp = aio_ex->fsp;
517 char *outbuf = (char *)aio_ex->outbuf.data;
518 ssize_t numtowrite = aio_ex->nbyte;
519 ssize_t nwritten;
520 int err;
521
522 nwritten = pwrite_fsync_recv(req, &err);
523 TALLOC_FREE(req);
524
525 DEBUG(10, ("pwrite_recv returned %d, err = %s\n", (int)nwritten,
526 (nwritten == -1) ? strerror(err) : "no error"));
527
528 if (fsp == NULL) {
529 DEBUG( 3, ("aio_pwrite_smb1_done: file closed whilst "
530 "aio outstanding (mid[%llu]).\n",
531 (unsigned long long)aio_ex->smbreq->mid));
532 TALLOC_FREE(aio_ex);
533 return;
534 }
535
536 mark_file_modified(fsp);
537
538 if (fsp->aio_write_behind) {
539
540 if (nwritten != numtowrite) {
541 if (nwritten == -1) {
542 DEBUG(5,("handle_aio_write_complete: "
543 "aio_write_behind failed ! File %s "
544 "is corrupt ! Error %s\n",
545 fsp_str_dbg(fsp), strerror(err)));
546 } else {
547 DEBUG(0,("handle_aio_write_complete: "
548 "aio_write_behind failed ! File %s "
549 "is corrupt ! Wanted %u bytes but "
550 "only wrote %d\n", fsp_str_dbg(fsp),
551 (unsigned int)numtowrite,
552 (int)nwritten ));
553 }
554 } else {
555 DEBUG(10,("handle_aio_write_complete: "
556 "aio_write_behind completed for file %s\n",
557 fsp_str_dbg(fsp)));
558 }
559 /* TODO: should no return success in case of an error !!! */
560 TALLOC_FREE(aio_ex);
561 return;
562 }
563
564 /* We don't need outsize or set_message here as we've already set the
565 fixed size length when we set up the aio call. */
566
567 if (nwritten == -1) {
568 DEBUG(3, ("handle_aio_write: file %s wanted %u bytes. "
569 "nwritten == %d. Error = %s\n",
570 fsp_str_dbg(fsp), (unsigned int)numtowrite,
571 (int)nwritten, strerror(err)));
572
573 ERROR_NT(map_nt_error_from_unix(err));
574 srv_set_message(outbuf,0,0,true);
575 } else {
576 SSVAL(outbuf,smb_vwv2,nwritten);
577 SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1);
578 if (nwritten < (ssize_t)numtowrite) {
579 SCVAL(outbuf,smb_rcls,ERRHRD);
580 SSVAL(outbuf,smb_err,ERRdiskfull);
581 }
582
583 DEBUG(3,("handle_aio_write: %s, num=%d wrote=%d\n",
584 fsp_fnum_dbg(fsp), (int)numtowrite, (int)nwritten));
585
586 aio_ex->fsp->fh->pos = aio_ex->offset + nwritten;
587 }
588
589 show_msg(outbuf);
590 if (!srv_send_smb(aio_ex->smbreq->xconn, outbuf,
591 true, aio_ex->smbreq->seqnum+1,
592 IS_CONN_ENCRYPTED(fsp->conn),
593 NULL)) {
594 exit_server_cleanly("handle_aio_write_complete: "
595 "srv_send_smb failed.");
596 }
597
598 DEBUG(10, ("handle_aio_write_complete: scheduled aio_write completed "
599 "for file %s, offset %.0f, requested %u, written = %u\n",
600 fsp_str_dbg(fsp), (double)aio_ex->offset,
601 (unsigned int)numtowrite, (unsigned int)nwritten));
602
603 TALLOC_FREE(aio_ex);
604 }
605
606 bool cancel_smb2_aio(struct smb_request *smbreq)
607 {
608 struct smbd_smb2_request *smb2req = smbreq->smb2req;
609 struct aio_extra *aio_ex = NULL;
610
611 if (smb2req) {
612 aio_ex = talloc_get_type(smbreq->async_priv,
613 struct aio_extra);
614 }
615
616 if (aio_ex == NULL) {
617 return false;
618 }
619
620 if (aio_ex->fsp == NULL) {
621 return false;
622 }
623
624 /*
625 * We let the aio request run. Setting fsp to NULL has the
626 * effect that the _done routines don't send anything out.
627 */
628
629 aio_ex->fsp = NULL;
630 return true;
631 }
632
633 static void aio_pread_smb2_done(struct tevent_req *req);
634
635 /****************************************************************************
636 Set up an aio request from a SMB2 read call.
637 *****************************************************************************/
638
639 NTSTATUS schedule_smb2_aio_read(connection_struct *conn,
640 struct smb_request *smbreq,
641 files_struct *fsp,
642 TALLOC_CTX *ctx,
643 DATA_BLOB *preadbuf,
644 off_t startpos,
645 size_t smb_maxcnt)
646 {
647 struct aio_extra *aio_ex;
648 size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
649 struct tevent_req *req;
650
651 if (fsp->base_fsp != NULL) {
652 /* No AIO on streams yet */
653 DEBUG(10, ("AIO on streams not yet supported\n"));
654 return NT_STATUS_RETRY;
655 }
656
657 if (fsp->op == NULL) {
658 /* No AIO on internal opens. */
659 return NT_STATUS_RETRY;
660 }
661
662 if ((!min_aio_read_size || (smb_maxcnt < min_aio_read_size))
663 && !SMB_VFS_AIO_FORCE(fsp)) {
664 /* Too small a read for aio request. */
665 DEBUG(10,("smb2: read size (%u) too small "
666 "for minimum aio_read of %u\n",
667 (unsigned int)smb_maxcnt,
668 (unsigned int)min_aio_read_size ));
669 return NT_STATUS_RETRY;
670 }
671
672 /* Only do this on reads not using the write cache. */
673 if (lp_write_cache_size(SNUM(conn)) != 0) {
674 return NT_STATUS_RETRY;
675 }
676
677 if (smbd_smb2_is_compound(smbreq->smb2req)) {
678 return NT_STATUS_RETRY;
679 }
680
681 /* Create the out buffer. */
682 *preadbuf = data_blob_talloc(ctx, NULL, smb_maxcnt);
683 if (preadbuf->data == NULL) {
684 return NT_STATUS_NO_MEMORY;
685 }
686
687 if (!(aio_ex = create_aio_extra(smbreq->smb2req, fsp, 0))) {
688 return NT_STATUS_NO_MEMORY;
689 }
690
691 init_strict_lock_struct(fsp, fsp->op->global->open_persistent_id,
692 (uint64_t)startpos, (uint64_t)smb_maxcnt, READ_LOCK,
693 &aio_ex->lock);
694
695 /* Take the lock until the AIO completes. */
696 if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &aio_ex->lock)) {
697 TALLOC_FREE(aio_ex);
698 return NT_STATUS_FILE_LOCK_CONFLICT;
699 }
700
701 aio_ex->nbyte = smb_maxcnt;
702 aio_ex->offset = startpos;
703
704 req = SMB_VFS_PREAD_SEND(aio_ex, smbreq->ev_ctx, fsp,
705 preadbuf->data, smb_maxcnt, startpos);
706 if (req == NULL) {
707 DEBUG(0, ("smb2: SMB_VFS_PREAD_SEND failed. "
708 "Error %s\n", strerror(errno)));
709 TALLOC_FREE(aio_ex);
710 return NT_STATUS_RETRY;
711 }
712 tevent_req_set_callback(req, aio_pread_smb2_done, aio_ex);
713
714 if (!aio_add_req_to_fsp(fsp, req)) {
715 DEBUG(1, ("Could not add req to fsp\n"));
716 TALLOC_FREE(aio_ex);
717 return NT_STATUS_RETRY;
718 }
719
720 /* We don't need talloc_move here as both aio_ex and
721 * smbreq are children of smbreq->smb2req. */
722 aio_ex->smbreq = smbreq;
723 smbreq->async_priv = aio_ex;
724
725 DEBUG(10,("smb2: scheduled aio_read for file %s, "
726 "offset %.0f, len = %u (mid = %u)\n",
727 fsp_str_dbg(fsp), (double)startpos, (unsigned int)smb_maxcnt,
728 (unsigned int)aio_ex->smbreq->mid ));
729
730 return NT_STATUS_OK;
731 }
732
733 static void aio_pread_smb2_done(struct tevent_req *req)
734 {
735 struct aio_extra *aio_ex = tevent_req_callback_data(
736 req, struct aio_extra);
737 struct tevent_req *subreq = aio_ex->smbreq->smb2req->subreq;
738 files_struct *fsp = aio_ex->fsp;
739 NTSTATUS status;
740 ssize_t nread;
741 struct vfs_aio_state vfs_aio_state = { 0 };
742
743 nread = SMB_VFS_PREAD_RECV(req, &vfs_aio_state);
744 TALLOC_FREE(req);
745
746 DEBUG(10, ("pread_recv returned %d, err = %s\n", (int)nread,
747 (nread == -1) ? strerror(vfs_aio_state.error) : "no error"));
748
749 if (fsp == NULL) {
750 DEBUG(3, ("%s: request cancelled (mid[%ju])\n",
751 __func__, (uintmax_t)aio_ex->smbreq->mid));
752 TALLOC_FREE(aio_ex);
753 tevent_req_nterror(subreq, NT_STATUS_INTERNAL_ERROR);
754 return;
755 }
756
757 /* Common error or success code processing for async or sync
758 read returns. */
759
760 status = smb2_read_complete(subreq, nread, vfs_aio_state.error);
761
762 if (nread > 0) {
763 fsp->fh->pos = aio_ex->offset + nread;
764 fsp->fh->position_information = fsp->fh->pos;
765 }
766
767 DEBUG(10, ("smb2: scheduled aio_read completed "
768 "for file %s, offset %.0f, len = %u "
769 "(errcode = %d, NTSTATUS = %s)\n",
770 fsp_str_dbg(aio_ex->fsp),
771 (double)aio_ex->offset,
772 (unsigned int)nread,
773 vfs_aio_state.error, nt_errstr(status)));
774
775 if (!NT_STATUS_IS_OK(status)) {
776 tevent_req_nterror(subreq, status);
777 return;
778 }
779 tevent_req_done(subreq);
780 }
781
782 static void aio_pwrite_smb2_done(struct tevent_req *req);
783
784 /****************************************************************************
785 Set up an aio request from a SMB2write call.
786 *****************************************************************************/
787
788 NTSTATUS schedule_aio_smb2_write(connection_struct *conn,
789 struct smb_request *smbreq,
790 files_struct *fsp,
791 uint64_t in_offset,
792 DATA_BLOB in_data,
793 bool write_through)
794 {
795 struct aio_extra *aio_ex = NULL;
796 size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
797 struct tevent_req *req;
798
799 if (fsp->base_fsp != NULL) {
800 /* No AIO on streams yet */
801 DEBUG(10, ("AIO on streams not yet supported\n"));
802 return NT_STATUS_RETRY;
803 }
804
805 if (fsp->op == NULL) {
806 /* No AIO on internal opens. */
807 return NT_STATUS_RETRY;
808 }
809
810 if ((!min_aio_write_size || (in_data.length < min_aio_write_size))
811 && !SMB_VFS_AIO_FORCE(fsp)) {
812 /* Too small a write for aio request. */
813 DEBUG(10,("smb2: write size (%u) too "
814 "small for minimum aio_write of %u\n",
815 (unsigned int)in_data.length,
816 (unsigned int)min_aio_write_size ));
817 return NT_STATUS_RETRY;
818 }
819
820 /* Only do this on writes not using the write cache. */
821 if (lp_write_cache_size(SNUM(conn)) != 0) {
822 return NT_STATUS_RETRY;
823 }
824
825 if (smbd_smb2_is_compound(smbreq->smb2req)) {
826 return NT_STATUS_RETRY;
827 }
828
829 if (smbreq->unread_bytes) {
830 /* Can't do async with recvfile. */
831 return NT_STATUS_RETRY;
832 }
833
834 if (!(aio_ex = create_aio_extra(smbreq->smb2req, fsp, 0))) {
835 return NT_STATUS_NO_MEMORY;
836 }
837
838 aio_ex->write_through = write_through;
839
840 init_strict_lock_struct(fsp, fsp->op->global->open_persistent_id,
841 in_offset, (uint64_t)in_data.length, WRITE_LOCK,
842 &aio_ex->lock);
843
844 /* Take the lock until the AIO completes. */
845 if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &aio_ex->lock)) {
846 TALLOC_FREE(aio_ex);
847 return NT_STATUS_FILE_LOCK_CONFLICT;
848 }
849
850 aio_ex->nbyte = in_data.length;
851 aio_ex->offset = in_offset;
852
853 req = pwrite_fsync_send(aio_ex, smbreq->ev_ctx, fsp,
854 in_data.data, in_data.length, in_offset,
855 write_through);
856 if (req == NULL) {
857 DEBUG(3, ("smb2: SMB_VFS_PWRITE_SEND failed. "
858 "Error %s\n", strerror(errno)));
859 TALLOC_FREE(aio_ex);
860 return NT_STATUS_RETRY;
861 }
862 tevent_req_set_callback(req, aio_pwrite_smb2_done, aio_ex);
863
864 if (!aio_add_req_to_fsp(fsp, req)) {
865 DEBUG(1, ("Could not add req to fsp\n"));
866 TALLOC_FREE(aio_ex);
867 return NT_STATUS_RETRY;
868 }
869
870 /* We don't need talloc_move here as both aio_ex and
871 * smbreq are children of smbreq->smb2req. */
872 aio_ex->smbreq = smbreq;
873 smbreq->async_priv = aio_ex;
874
875 /* This should actually be improved to span the write. */
876 contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
877 contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
878
879 /*
880 * We don't want to do write behind due to ownership
881 * issues of the request structs. Maybe add it if I
882 * figure those out. JRA.
883 */
884
885 DEBUG(10,("smb2: scheduled aio_write for file "
886 "%s, offset %.0f, len = %u (mid = %u)\n",
887 fsp_str_dbg(fsp),
888 (double)in_offset,
889 (unsigned int)in_data.length,
890 (unsigned int)aio_ex->smbreq->mid));
891
892 return NT_STATUS_OK;
893 }
894
895 static void aio_pwrite_smb2_done(struct tevent_req *req)
896 {
897 struct aio_extra *aio_ex = tevent_req_callback_data(
898 req, struct aio_extra);
899 ssize_t numtowrite = aio_ex->nbyte;
900 struct tevent_req *subreq = aio_ex->smbreq->smb2req->subreq;
901 files_struct *fsp = aio_ex->fsp;
902 NTSTATUS status;
903 ssize_t nwritten;
904 int err = 0;
905
906 nwritten = pwrite_fsync_recv(req, &err);
907 TALLOC_FREE(req);
908
909 DEBUG(10, ("pwrite_recv returned %d, err = %s\n", (int)nwritten,
910 (nwritten == -1) ? strerror(err) : "no error"));
911
912 if (fsp == NULL) {
913 DEBUG(3, ("%s: request cancelled (mid[%ju])\n",
914 __func__, (uintmax_t)aio_ex->smbreq->mid));
915 TALLOC_FREE(aio_ex);
916 tevent_req_nterror(subreq, NT_STATUS_INTERNAL_ERROR);
917 return;
918 }
919
920 mark_file_modified(fsp);
921
922 status = smb2_write_complete_nosync(subreq, nwritten, err);
923
924 DEBUG(10, ("smb2: scheduled aio_write completed "
925 "for file %s, offset %.0f, requested %u, "
926 "written = %u (errcode = %d, NTSTATUS = %s)\n",
927 fsp_str_dbg(fsp),
928 (double)aio_ex->offset,
929 (unsigned int)numtowrite,
930 (unsigned int)nwritten,
931 err, nt_errstr(status)));
932
933 if (!NT_STATUS_IS_OK(status)) {
934 tevent_req_nterror(subreq, status);
935 return;
936 }
937 tevent_req_done(subreq);
938 }
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