Line data Source code
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 :
27 : static void aio_pread_smb1_done(struct tevent_req *req);
28 :
29 : /****************************************************************************
30 : Set up an aio request from a SMBreadX call.
31 : *****************************************************************************/
32 :
33 9590 : NTSTATUS schedule_aio_read_and_X(connection_struct *conn,
34 : struct smb_request *smbreq,
35 : files_struct *fsp, off_t startpos,
36 : size_t smb_maxcnt)
37 : {
38 46 : struct aio_extra *aio_ex;
39 46 : size_t bufsize;
40 9590 : size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
41 46 : struct tevent_req *req;
42 46 : bool ok;
43 :
44 9590 : ok = vfs_valid_pread_range(startpos, smb_maxcnt);
45 9590 : if (!ok) {
46 0 : return NT_STATUS_INVALID_PARAMETER;
47 : }
48 :
49 9590 : if (fsp_is_alternate_stream(fsp)) {
50 28 : DEBUG(10, ("AIO on streams not yet supported\n"));
51 28 : return NT_STATUS_RETRY;
52 : }
53 :
54 9562 : if ((!min_aio_read_size || (smb_maxcnt < min_aio_read_size))
55 15 : && !SMB_VFS_AIO_FORCE(fsp)) {
56 : /* Too small a read for aio request. */
57 15 : DEBUG(10,("schedule_aio_read_and_X: read size (%u) too small "
58 : "for minimum aio_read of %u\n",
59 : (unsigned int)smb_maxcnt,
60 : (unsigned int)min_aio_read_size ));
61 15 : return NT_STATUS_RETRY;
62 : }
63 :
64 : /* Only do this on non-chained and non-chaining reads */
65 9547 : if (req_is_in_chain(smbreq)) {
66 10 : return NT_STATUS_RETRY;
67 : }
68 :
69 : /* The following is safe from integer wrap as we've already checked
70 : smb_maxcnt is 128k or less. Wct is 12 for read replies */
71 :
72 9537 : bufsize = smb_size + 12 * 2 + smb_maxcnt + 1 /* padding byte */;
73 :
74 9537 : if ((aio_ex = create_aio_extra(NULL, fsp, bufsize)) == NULL) {
75 0 : DEBUG(10,("schedule_aio_read_and_X: malloc fail.\n"));
76 0 : return NT_STATUS_NO_MEMORY;
77 : }
78 :
79 9537 : construct_smb1_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
80 9537 : srv_smb1_set_message((char *)aio_ex->outbuf.data, 12, 0, True);
81 9537 : SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
82 9537 : SCVAL(smb_buf(aio_ex->outbuf.data), 0, 0); /* padding byte */
83 :
84 9537 : init_strict_lock_struct(fsp,
85 9537 : (uint64_t)smbreq->smbpid,
86 : (uint64_t)startpos,
87 : (uint64_t)smb_maxcnt,
88 : READ_LOCK,
89 : lp_posix_cifsu_locktype(fsp),
90 : &aio_ex->lock);
91 :
92 : /* Take the lock until the AIO completes. */
93 9537 : if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &aio_ex->lock)) {
94 21 : TALLOC_FREE(aio_ex);
95 21 : return NT_STATUS_FILE_LOCK_CONFLICT;
96 : }
97 :
98 9516 : aio_ex->nbyte = smb_maxcnt;
99 9516 : aio_ex->offset = startpos;
100 :
101 9516 : req = SMB_VFS_PREAD_SEND(aio_ex, fsp->conn->sconn->ev_ctx,
102 : fsp,
103 : smb_buf(aio_ex->outbuf.data) + 1 /* pad */,
104 : smb_maxcnt, startpos);
105 9516 : if (req == NULL) {
106 0 : DEBUG(0,("schedule_aio_read_and_X: aio_read failed. "
107 : "Error %s\n", strerror(errno) ));
108 0 : TALLOC_FREE(aio_ex);
109 0 : return NT_STATUS_RETRY;
110 : }
111 9516 : tevent_req_set_callback(req, aio_pread_smb1_done, aio_ex);
112 :
113 9516 : if (!aio_add_req_to_fsp(fsp, req)) {
114 0 : DEBUG(1, ("Could not add req to fsp\n"));
115 0 : TALLOC_FREE(aio_ex);
116 0 : return NT_STATUS_RETRY;
117 : }
118 :
119 9516 : aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
120 :
121 9516 : DEBUG(10,("schedule_aio_read_and_X: scheduled aio_read for file %s, "
122 : "offset %.0f, len = %u (mid = %u)\n",
123 : fsp_str_dbg(fsp), (double)startpos, (unsigned int)smb_maxcnt,
124 : (unsigned int)aio_ex->smbreq->mid ));
125 :
126 9516 : return NT_STATUS_OK;
127 : }
128 :
129 9516 : static void aio_pread_smb1_done(struct tevent_req *req)
130 : {
131 9516 : struct aio_extra *aio_ex = tevent_req_callback_data(
132 : req, struct aio_extra);
133 9516 : files_struct *fsp = aio_ex->fsp;
134 42 : size_t outsize;
135 9516 : char *outbuf = (char *)aio_ex->outbuf.data;
136 42 : ssize_t nread;
137 42 : struct vfs_aio_state vfs_aio_state;
138 :
139 9516 : nread = SMB_VFS_PREAD_RECV(req, &vfs_aio_state);
140 9516 : TALLOC_FREE(req);
141 :
142 9516 : DEBUG(10, ("pread_recv returned %d, err = %s\n", (int)nread,
143 : (nread == -1) ? strerror(vfs_aio_state.error) : "no error"));
144 :
145 9516 : if (fsp == NULL) {
146 0 : DEBUG( 3, ("aio_pread_smb1_done: file closed whilst "
147 : "aio outstanding (mid[%llu]).\n",
148 : (unsigned long long)aio_ex->smbreq->mid));
149 0 : TALLOC_FREE(aio_ex);
150 0 : return;
151 : }
152 :
153 9516 : if (nread < 0) {
154 0 : DEBUG( 3, ("handle_aio_read_complete: file %s nread == %d. "
155 : "Error = %s\n", fsp_str_dbg(fsp), (int)nread,
156 : strerror(vfs_aio_state.error)));
157 :
158 0 : ERROR_NT(map_nt_error_from_unix(vfs_aio_state.error));
159 0 : outsize = srv_smb1_set_message(outbuf,0,0,true);
160 : } else {
161 9516 : outsize = setup_readX_header(outbuf, nread);
162 :
163 9516 : fh_set_pos(aio_ex->fsp->fh, aio_ex->offset + nread);
164 9516 : fh_set_position_information(aio_ex->fsp->fh,
165 9516 : fh_get_pos(aio_ex->fsp->fh));
166 :
167 9516 : DEBUG( 3, ("handle_aio_read_complete file %s max=%d "
168 : "nread=%d\n", fsp_str_dbg(fsp),
169 : (int)aio_ex->nbyte, (int)nread ) );
170 :
171 : }
172 :
173 9516 : if (outsize <= 4) {
174 0 : DBG_INFO("Invalid outsize (%zu)\n", outsize);
175 0 : TALLOC_FREE(aio_ex);
176 0 : return;
177 : }
178 9516 : outsize -= 4;
179 9516 : _smb_setlen_large(outbuf, outsize);
180 :
181 9516 : show_msg(outbuf);
182 9516 : if (!smb1_srv_send(aio_ex->smbreq->xconn,
183 : outbuf,
184 : true,
185 9516 : aio_ex->smbreq->seqnum + 1,
186 9516 : IS_CONN_ENCRYPTED(fsp->conn))) {
187 0 : exit_server_cleanly("handle_aio_read_complete: smb1_srv_send "
188 : "failed.");
189 : }
190 :
191 9516 : DEBUG(10, ("handle_aio_read_complete: scheduled aio_read completed "
192 : "for file %s, offset %.0f, len = %u\n",
193 : fsp_str_dbg(fsp), (double)aio_ex->offset,
194 : (unsigned int)nread));
195 :
196 9516 : TALLOC_FREE(aio_ex);
197 : }
198 :
199 : static void aio_pwrite_smb1_done(struct tevent_req *req);
200 :
201 : /****************************************************************************
202 : Set up an aio request from a SMBwriteX call.
203 : *****************************************************************************/
204 :
205 132522 : NTSTATUS schedule_aio_write_and_X(connection_struct *conn,
206 : struct smb_request *smbreq,
207 : files_struct *fsp, const char *data,
208 : off_t startpos,
209 : size_t numtowrite)
210 : {
211 53 : struct aio_extra *aio_ex;
212 53 : size_t bufsize;
213 132522 : size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
214 53 : struct tevent_req *req;
215 :
216 132522 : if (fsp_is_alternate_stream(fsp)) {
217 32 : DEBUG(10, ("AIO on streams not yet supported\n"));
218 32 : return NT_STATUS_RETRY;
219 : }
220 :
221 132490 : if ((!min_aio_write_size || (numtowrite < min_aio_write_size))
222 0 : && !SMB_VFS_AIO_FORCE(fsp)) {
223 : /* Too small a write for aio request. */
224 0 : DEBUG(10,("schedule_aio_write_and_X: write size (%u) too "
225 : "small for minimum aio_write of %u\n",
226 : (unsigned int)numtowrite,
227 : (unsigned int)min_aio_write_size ));
228 0 : return NT_STATUS_RETRY;
229 : }
230 :
231 : /* Only do this on non-chained and non-chaining writes */
232 132490 : if (req_is_in_chain(smbreq)) {
233 8 : return NT_STATUS_RETRY;
234 : }
235 :
236 132482 : bufsize = smb_size + 6*2;
237 :
238 132482 : if (!(aio_ex = create_aio_extra(NULL, fsp, bufsize))) {
239 0 : DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n"));
240 0 : return NT_STATUS_NO_MEMORY;
241 : }
242 132482 : aio_ex->write_through = BITSETW(smbreq->vwv+7,0);
243 :
244 132482 : construct_smb1_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
245 132482 : srv_smb1_set_message((char *)aio_ex->outbuf.data, 6, 0, True);
246 132482 : SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
247 :
248 132482 : init_strict_lock_struct(fsp,
249 132482 : (uint64_t)smbreq->smbpid,
250 : (uint64_t)startpos,
251 : (uint64_t)numtowrite,
252 : WRITE_LOCK,
253 : lp_posix_cifsu_locktype(fsp),
254 : &aio_ex->lock);
255 :
256 : /* Take the lock until the AIO completes. */
257 132482 : if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &aio_ex->lock)) {
258 45 : TALLOC_FREE(aio_ex);
259 45 : return NT_STATUS_FILE_LOCK_CONFLICT;
260 : }
261 :
262 132437 : aio_ex->nbyte = numtowrite;
263 132437 : aio_ex->offset = startpos;
264 :
265 132489 : req = pwrite_fsync_send(aio_ex, fsp->conn->sconn->ev_ctx, fsp,
266 : data, numtowrite, startpos,
267 132437 : aio_ex->write_through);
268 132437 : if (req == NULL) {
269 0 : DEBUG(3,("schedule_aio_wrote_and_X: aio_write failed. "
270 : "Error %s\n", strerror(errno) ));
271 0 : TALLOC_FREE(aio_ex);
272 0 : return NT_STATUS_RETRY;
273 : }
274 132437 : tevent_req_set_callback(req, aio_pwrite_smb1_done, aio_ex);
275 :
276 132437 : if (!aio_add_req_to_fsp(fsp, req)) {
277 0 : DEBUG(1, ("Could not add req to fsp\n"));
278 0 : TALLOC_FREE(aio_ex);
279 0 : return NT_STATUS_RETRY;
280 : }
281 :
282 132437 : aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
283 :
284 : /* This should actually be improved to span the write. */
285 132437 : contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
286 132437 : contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
287 :
288 132437 : if (!aio_ex->write_through && !lp_sync_always(SNUM(fsp->conn))
289 132368 : && fsp->fsp_flags.aio_write_behind)
290 : {
291 : /* Lie to the client and immediately claim we finished the
292 : * write. */
293 0 : SSVAL(aio_ex->outbuf.data,smb_vwv2,numtowrite);
294 0 : SSVAL(aio_ex->outbuf.data,smb_vwv4,(numtowrite>>16)&1);
295 0 : show_msg((char *)aio_ex->outbuf.data);
296 0 : if (!smb1_srv_send(aio_ex->smbreq->xconn,
297 0 : (char *)aio_ex->outbuf.data,
298 : true,
299 0 : aio_ex->smbreq->seqnum + 1,
300 0 : IS_CONN_ENCRYPTED(fsp->conn))) {
301 0 : exit_server_cleanly("schedule_aio_write_and_X: "
302 : "smb1_srv_send failed.");
303 : }
304 0 : DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write "
305 : "behind for file %s\n", fsp_str_dbg(fsp)));
306 : }
307 :
308 132437 : DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write for file "
309 : "%s, offset %.0f, len = %u (mid = %u)\n",
310 : fsp_str_dbg(fsp), (double)startpos, (unsigned int)numtowrite,
311 : (unsigned int)aio_ex->smbreq->mid));
312 :
313 132437 : return NT_STATUS_OK;
314 : }
315 :
316 132437 : static void aio_pwrite_smb1_done(struct tevent_req *req)
317 : {
318 132437 : struct aio_extra *aio_ex = tevent_req_callback_data(
319 : req, struct aio_extra);
320 132437 : files_struct *fsp = aio_ex->fsp;
321 132437 : char *outbuf = (char *)aio_ex->outbuf.data;
322 132437 : ssize_t numtowrite = aio_ex->nbyte;
323 52 : ssize_t nwritten;
324 52 : int err;
325 :
326 132437 : nwritten = pwrite_fsync_recv(req, &err);
327 132437 : TALLOC_FREE(req);
328 :
329 132437 : DEBUG(10, ("pwrite_recv returned %d, err = %s\n", (int)nwritten,
330 : (nwritten == -1) ? strerror(err) : "no error"));
331 :
332 132437 : if (fsp == NULL) {
333 0 : DEBUG( 3, ("aio_pwrite_smb1_done: file closed whilst "
334 : "aio outstanding (mid[%llu]).\n",
335 : (unsigned long long)aio_ex->smbreq->mid));
336 0 : TALLOC_FREE(aio_ex);
337 0 : return;
338 : }
339 :
340 132437 : mark_file_modified(fsp);
341 :
342 132437 : if (fsp->fsp_flags.aio_write_behind) {
343 :
344 0 : if (nwritten != numtowrite) {
345 0 : if (nwritten == -1) {
346 0 : DEBUG(5,("handle_aio_write_complete: "
347 : "aio_write_behind failed ! File %s "
348 : "is corrupt ! Error %s\n",
349 : fsp_str_dbg(fsp), strerror(err)));
350 : } else {
351 0 : DEBUG(0,("handle_aio_write_complete: "
352 : "aio_write_behind failed ! File %s "
353 : "is corrupt ! Wanted %u bytes but "
354 : "only wrote %d\n", fsp_str_dbg(fsp),
355 : (unsigned int)numtowrite,
356 : (int)nwritten ));
357 : }
358 : } else {
359 0 : DEBUG(10,("handle_aio_write_complete: "
360 : "aio_write_behind completed for file %s\n",
361 : fsp_str_dbg(fsp)));
362 : }
363 : /* TODO: should no return success in case of an error !!! */
364 0 : TALLOC_FREE(aio_ex);
365 0 : return;
366 : }
367 :
368 : /* We don't need outsize or set_message here as we've already set the
369 : fixed size length when we set up the aio call. */
370 :
371 132437 : if (nwritten == -1) {
372 0 : DEBUG(3, ("handle_aio_write: file %s wanted %u bytes. "
373 : "nwritten == %d. Error = %s\n",
374 : fsp_str_dbg(fsp), (unsigned int)numtowrite,
375 : (int)nwritten, strerror(err)));
376 :
377 0 : ERROR_NT(map_nt_error_from_unix(err));
378 0 : srv_smb1_set_message(outbuf,0,0,true);
379 : } else {
380 132437 : SSVAL(outbuf,smb_vwv2,nwritten);
381 132437 : SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1);
382 132437 : if (nwritten < (ssize_t)numtowrite) {
383 0 : SCVAL(outbuf,smb_rcls,ERRHRD);
384 0 : SSVAL(outbuf,smb_err,ERRdiskfull);
385 : }
386 :
387 132437 : DEBUG(3,("handle_aio_write: %s, num=%d wrote=%d\n",
388 : fsp_fnum_dbg(fsp), (int)numtowrite, (int)nwritten));
389 :
390 132437 : fh_set_pos(aio_ex->fsp->fh, aio_ex->offset + nwritten);
391 : }
392 :
393 132437 : show_msg(outbuf);
394 132437 : if (!smb1_srv_send(aio_ex->smbreq->xconn,
395 : outbuf,
396 : true,
397 132437 : aio_ex->smbreq->seqnum + 1,
398 132437 : IS_CONN_ENCRYPTED(fsp->conn))) {
399 0 : exit_server_cleanly("handle_aio_write_complete: "
400 : "smb1_srv_send failed.");
401 : }
402 :
403 132437 : DEBUG(10, ("handle_aio_write_complete: scheduled aio_write completed "
404 : "for file %s, offset %.0f, requested %u, written = %u\n",
405 : fsp_str_dbg(fsp), (double)aio_ex->offset,
406 : (unsigned int)numtowrite, (unsigned int)nwritten));
407 :
408 132437 : TALLOC_FREE(aio_ex);
409 : }
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