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utils: Fix up 14a533680245
[samba4-gss.git] / source3 / smbd / smb1_aio.c
blobd54a37273120047fa198a1e18234df6f799cab96
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 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 struct aio_extra *aio_ex;
39 size_t bufsize;
40 size_t min_aio_read_size = lp_aio_read_size(SNUM(conn));
41 struct tevent_req *req;
42 bool ok;
43
44 ok = vfs_valid_pread_range(startpos, smb_maxcnt);
45 if (!ok) {
46 return NT_STATUS_INVALID_PARAMETER;
47 }
48
49 if (fsp_is_alternate_stream(fsp)) {
50 DEBUG(10, ("AIO on streams not yet supported\n"));
51 return NT_STATUS_RETRY;
52 }
53
54 if ((!min_aio_read_size || (smb_maxcnt < min_aio_read_size))
55 && !SMB_VFS_AIO_FORCE(fsp)) {
56 /* Too small a read for aio request. */
57 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 return NT_STATUS_RETRY;
62 }
63
64 /* Only do this on non-chained and non-chaining reads */
65 if (req_is_in_chain(smbreq)) {
66 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 bufsize = smb_size + 12 * 2 + smb_maxcnt + 1 /* padding byte */;
73
74 if ((aio_ex = create_aio_extra(NULL, fsp, bufsize)) == NULL) {
75 DEBUG(10,("schedule_aio_read_and_X: malloc fail.\n"));
76 return NT_STATUS_NO_MEMORY;
77 }
78
79 construct_smb1_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
80 srv_smb1_set_message((char *)aio_ex->outbuf.data, 12, 0, True);
81 SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
82 SCVAL(smb_buf(aio_ex->outbuf.data), 0, 0); /* padding byte */
83
84 init_strict_lock_struct(fsp,
85 (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 if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &aio_ex->lock)) {
94 TALLOC_FREE(aio_ex);
95 return NT_STATUS_FILE_LOCK_CONFLICT;
96 }
97
98 aio_ex->nbyte = smb_maxcnt;
99 aio_ex->offset = startpos;
100
101 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 if (req == NULL) {
106 DEBUG(0,("schedule_aio_read_and_X: aio_read failed. "
107 "Error %s\n", strerror(errno) ));
108 TALLOC_FREE(aio_ex);
109 return NT_STATUS_RETRY;
110 }
111 tevent_req_set_callback(req, aio_pread_smb1_done, aio_ex);
112
113 if (!aio_add_req_to_fsp(fsp, req)) {
114 DEBUG(1, ("Could not add req to fsp\n"));
115 TALLOC_FREE(aio_ex);
116 return NT_STATUS_RETRY;
117 }
118
119 aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
120
121 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 return NT_STATUS_OK;
127 }
128
129 static void aio_pread_smb1_done(struct tevent_req *req)
130 {
131 struct aio_extra *aio_ex = tevent_req_callback_data(
132 req, struct aio_extra);
133 files_struct *fsp = aio_ex->fsp;
134 size_t outsize;
135 char *outbuf = (char *)aio_ex->outbuf.data;
136 ssize_t nread;
137 struct vfs_aio_state vfs_aio_state;
138
139 nread = SMB_VFS_PREAD_RECV(req, &vfs_aio_state);
140 TALLOC_FREE(req);
141
142 DEBUG(10, ("pread_recv returned %d, err = %s\n", (int)nread,
143 (nread == -1) ? strerror(vfs_aio_state.error) : "no error"));
144
145 if (fsp == NULL) {
146 DEBUG( 3, ("aio_pread_smb1_done: file closed whilst "
147 "aio outstanding (mid[%llu]).\n",
148 (unsigned long long)aio_ex->smbreq->mid));
149 TALLOC_FREE(aio_ex);
150 return;
151 }
152
153 if (nread < 0) {
154 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 ERROR_NT(map_nt_error_from_unix(vfs_aio_state.error));
159 outsize = srv_smb1_set_message(outbuf,0,0,true);
160 } else {
161 outsize = setup_readX_header(outbuf, nread);
162
163 fh_set_pos(aio_ex->fsp->fh, aio_ex->offset + nread);
164 fh_set_position_information(aio_ex->fsp->fh,
165 fh_get_pos(aio_ex->fsp->fh));
166
167 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 if (outsize <= 4) {
174 DBG_INFO("Invalid outsize (%zu)\n", outsize);
175 TALLOC_FREE(aio_ex);
176 return;
177 }
178 outsize -= 4;
179 _smb_setlen_large(outbuf, outsize);
180
181 show_msg(outbuf);
182 if (!smb1_srv_send(aio_ex->smbreq->xconn,
183 outbuf,
184 true,
185 aio_ex->smbreq->seqnum + 1,
186 IS_CONN_ENCRYPTED(fsp->conn))) {
187 exit_server_cleanly("handle_aio_read_complete: smb1_srv_send "
188 "failed.");
189 }
190
191 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 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 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 struct aio_extra *aio_ex;
212 size_t bufsize;
213 size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
214 struct tevent_req *req;
215
216 if (fsp_is_alternate_stream(fsp)) {
217 DEBUG(10, ("AIO on streams not yet supported\n"));
218 return NT_STATUS_RETRY;
219 }
220
221 if ((!min_aio_write_size || (numtowrite < min_aio_write_size))
222 && !SMB_VFS_AIO_FORCE(fsp)) {
223 /* Too small a write for aio request. */
224 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 return NT_STATUS_RETRY;
229 }
230
231 /* Only do this on non-chained and non-chaining writes */
232 if (req_is_in_chain(smbreq)) {
233 return NT_STATUS_RETRY;
234 }
235
236 bufsize = smb_size + 6*2;
237
238 if (!(aio_ex = create_aio_extra(NULL, fsp, bufsize))) {
239 DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n"));
240 return NT_STATUS_NO_MEMORY;
241 }
242 aio_ex->write_through = BITSETW(smbreq->vwv+7,0);
243
244 construct_smb1_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
245 srv_smb1_set_message((char *)aio_ex->outbuf.data, 6, 0, True);
246 SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
247
248 init_strict_lock_struct(fsp,
249 (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 if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &aio_ex->lock)) {
258 TALLOC_FREE(aio_ex);
259 return NT_STATUS_FILE_LOCK_CONFLICT;
260 }
261
262 aio_ex->nbyte = numtowrite;
263 aio_ex->offset = startpos;
264
265 req = pwrite_fsync_send(aio_ex, fsp->conn->sconn->ev_ctx, fsp,
266 data, numtowrite, startpos,
267 aio_ex->write_through);
268 if (req == NULL) {
269 DEBUG(3,("schedule_aio_wrote_and_X: aio_write failed. "
270 "Error %s\n", strerror(errno) ));
271 TALLOC_FREE(aio_ex);
272 return NT_STATUS_RETRY;
273 }
274 tevent_req_set_callback(req, aio_pwrite_smb1_done, aio_ex);
275
276 if (!aio_add_req_to_fsp(fsp, req)) {
277 DEBUG(1, ("Could not add req to fsp\n"));
278 TALLOC_FREE(aio_ex);
279 return NT_STATUS_RETRY;
280 }
281
282 aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
283
284 /* This should actually be improved to span the write. */
285 contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
286 contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
287
288 if (!aio_ex->write_through && !lp_sync_always(SNUM(fsp->conn))
289 && fsp->fsp_flags.aio_write_behind)
290 {
291 /* Lie to the client and immediately claim we finished the
292 * write. */
293 SSVAL(aio_ex->outbuf.data,smb_vwv2,numtowrite);
294 SSVAL(aio_ex->outbuf.data,smb_vwv4,(numtowrite>>16)&1);
295 show_msg((char *)aio_ex->outbuf.data);
296 if (!smb1_srv_send(aio_ex->smbreq->xconn,
297 (char *)aio_ex->outbuf.data,
298 true,
299 aio_ex->smbreq->seqnum + 1,
300 IS_CONN_ENCRYPTED(fsp->conn))) {
301 exit_server_cleanly("schedule_aio_write_and_X: "
302 "smb1_srv_send failed.");
303 }
304 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write "
305 "behind for file %s\n", fsp_str_dbg(fsp)));
306 }
307
308 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 return NT_STATUS_OK;
314 }
315
316 static void aio_pwrite_smb1_done(struct tevent_req *req)
317 {
318 struct aio_extra *aio_ex = tevent_req_callback_data(
319 req, struct aio_extra);
320 files_struct *fsp = aio_ex->fsp;
321 char *outbuf = (char *)aio_ex->outbuf.data;
322 ssize_t numtowrite = aio_ex->nbyte;
323 ssize_t nwritten;
324 int err;
325
326 nwritten = pwrite_fsync_recv(req, &err);
327 TALLOC_FREE(req);
328
329 DEBUG(10, ("pwrite_recv returned %d, err = %s\n", (int)nwritten,
330 (nwritten == -1) ? strerror(err) : "no error"));
331
332 if (fsp == NULL) {
333 DEBUG( 3, ("aio_pwrite_smb1_done: file closed whilst "
334 "aio outstanding (mid[%llu]).\n",
335 (unsigned long long)aio_ex->smbreq->mid));
336 TALLOC_FREE(aio_ex);
337 return;
338 }
339
340 mark_file_modified(fsp);
341
342 if (fsp->fsp_flags.aio_write_behind) {
343
344 if (nwritten != numtowrite) {
345 if (nwritten == -1) {
346 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 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 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 TALLOC_FREE(aio_ex);
365 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 if (nwritten == -1) {
372 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 ERROR_NT(map_nt_error_from_unix(err));
378 srv_smb1_set_message(outbuf,0,0,true);
379 } else {
380 SSVAL(outbuf,smb_vwv2,nwritten);
381 SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1);
382 if (nwritten < (ssize_t)numtowrite) {
383 SCVAL(outbuf,smb_rcls,ERRHRD);
384 SSVAL(outbuf,smb_err,ERRdiskfull);
385 }
386
387 DEBUG(3,("handle_aio_write: %s, num=%d wrote=%d\n",
388 fsp_fnum_dbg(fsp), (int)numtowrite, (int)nwritten));
389
390 fh_set_pos(aio_ex->fsp->fh, aio_ex->offset + nwritten);
391 }
392
393 show_msg(outbuf);
394 if (!smb1_srv_send(aio_ex->smbreq->xconn,
395 outbuf,
396 true,
397 aio_ex->smbreq->seqnum + 1,
398 IS_CONN_ENCRYPTED(fsp->conn))) {
399 exit_server_cleanly("handle_aio_write_complete: "
400 "smb1_srv_send failed.");
401 }
402
403 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 TALLOC_FREE(aio_ex);
409 }
GSS-enabled samba4