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