source3/smbd/smb1_aio.c

   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, outbuf,
 183                           true, aio_ex->smbreq->seqnum+1,
 184                           IS_CONN_ENCRYPTED(fsp->conn), NULL)) {
 185                 exit_server_cleanly("handle_aio_read_complete: smb1_srv_send "
 186                                     "failed.");
 187         }
 188
 189         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         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 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         size_t min_aio_write_size = lp_aio_write_size(SNUM(conn));
 212         struct tevent_req *req;
 213
 214         if (fsp_is_alternate_stream(fsp)) {
 215                 DEBUG(10, ("AIO on streams not yet supported\n"));
 216                 return NT_STATUS_RETRY;
 217         }
 218
 219         if ((!min_aio_write_size || (numtowrite < min_aio_write_size))
 220             && !SMB_VFS_AIO_FORCE(fsp)) {
 221                 /* Too small a write for aio request. */
 222                 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                 return NT_STATUS_RETRY;
 227         }
 228
 229         /* Only do this on non-chained and non-chaining writes */
 230         if (req_is_in_chain(smbreq)) {
 231                 return NT_STATUS_RETRY;
 232         }
 233
 234         bufsize = smb_size + 6*2;
 235
 236         if (!(aio_ex = create_aio_extra(NULL, fsp, bufsize))) {
 237                 DEBUG(0,("schedule_aio_write_and_X: malloc fail.\n"));
 238                 return NT_STATUS_NO_MEMORY;
 239         }
 240         aio_ex->write_through = BITSETW(smbreq->vwv+7,0);
 241
 242         construct_smb1_reply_common_req(smbreq, (char *)aio_ex->outbuf.data);
 243         srv_smb1_set_message((char *)aio_ex->outbuf.data, 6, 0, True);
 244         SCVAL(aio_ex->outbuf.data,smb_vwv0,0xFF); /* Never a chained reply. */
 245
 246         init_strict_lock_struct(fsp,
 247                         (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         if (!SMB_VFS_STRICT_LOCK_CHECK(conn, fsp, &aio_ex->lock)) {
 256                 TALLOC_FREE(aio_ex);
 257                 return NT_STATUS_FILE_LOCK_CONFLICT;
 258         }
 259
 260         aio_ex->nbyte = numtowrite;
 261         aio_ex->offset = startpos;
 262
 263         req = pwrite_fsync_send(aio_ex, fsp->conn->sconn->ev_ctx, fsp,
 264                                 data, numtowrite, startpos,
 265                                 aio_ex->write_through);
 266         if (req == NULL) {
 267                 DEBUG(3,("schedule_aio_wrote_and_X: aio_write failed. "
 268                          "Error %s\n", strerror(errno) ));
 269                 TALLOC_FREE(aio_ex);
 270                 return NT_STATUS_RETRY;
 271         }
 272         tevent_req_set_callback(req, aio_pwrite_smb1_done, aio_ex);
 273
 274         if (!aio_add_req_to_fsp(fsp, req)) {
 275                 DEBUG(1, ("Could not add req to fsp\n"));
 276                 TALLOC_FREE(aio_ex);
 277                 return NT_STATUS_RETRY;
 278         }
 279
 280         aio_ex->smbreq = talloc_move(aio_ex, &smbreq);
 281
 282         /* This should actually be improved to span the write. */
 283         contend_level2_oplocks_begin(fsp, LEVEL2_CONTEND_WRITE);
 284         contend_level2_oplocks_end(fsp, LEVEL2_CONTEND_WRITE);
 285
 286         if (!aio_ex->write_through && !lp_sync_always(SNUM(fsp->conn))
 287             && fsp->fsp_flags.aio_write_behind)
 288         {
 289                 /* Lie to the client and immediately claim we finished the
 290                  * write. */
 291                 SSVAL(aio_ex->outbuf.data,smb_vwv2,numtowrite);
 292                 SSVAL(aio_ex->outbuf.data,smb_vwv4,(numtowrite>>16)&1);
 293                 show_msg((char *)aio_ex->outbuf.data);
 294                 if (!smb1_srv_send(aio_ex->smbreq->xconn,
 295                                 (char *)aio_ex->outbuf.data,
 296                                 true, aio_ex->smbreq->seqnum+1,
 297                                 IS_CONN_ENCRYPTED(fsp->conn),
 298                                 &aio_ex->smbreq->pcd)) {
 299                         exit_server_cleanly("schedule_aio_write_and_X: "
 300                                             "smb1_srv_send failed.");
 301                 }
 302                 DEBUG(10,("schedule_aio_write_and_X: scheduled aio_write "
 303                           "behind for file %s\n", fsp_str_dbg(fsp)));
 304         }
 305
 306         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         return NT_STATUS_OK;
 312 }
 313
 314 static void aio_pwrite_smb1_done(struct tevent_req *req)
 315 {
 316         struct aio_extra *aio_ex = tevent_req_callback_data(
 317                 req, struct aio_extra);
 318         files_struct *fsp = aio_ex->fsp;
 319         char *outbuf = (char *)aio_ex->outbuf.data;
 320         ssize_t numtowrite = aio_ex->nbyte;
 321         ssize_t nwritten;
 322         int err;
 323
 324         nwritten = pwrite_fsync_recv(req, &err);
 325         TALLOC_FREE(req);
 326
 327         DEBUG(10, ("pwrite_recv returned %d, err = %s\n", (int)nwritten,
 328                    (nwritten == -1) ? strerror(err) : "no error"));
 329
 330         if (fsp == NULL) {
 331                 DEBUG( 3, ("aio_pwrite_smb1_done: file closed whilst "
 332                            "aio outstanding (mid[%llu]).\n",
 333                            (unsigned long long)aio_ex->smbreq->mid));
 334                 TALLOC_FREE(aio_ex);
 335                 return;
 336         }
 337
 338         mark_file_modified(fsp);
 339
 340         if (fsp->fsp_flags.aio_write_behind) {
 341
 342                 if (nwritten != numtowrite) {
 343                         if (nwritten == -1) {
 344                                 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                                 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                         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                 TALLOC_FREE(aio_ex);
 363                 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         if (nwritten == -1) {
 370                 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                 ERROR_NT(map_nt_error_from_unix(err));
 376                 srv_smb1_set_message(outbuf,0,0,true);
 377         } else {
 378                 SSVAL(outbuf,smb_vwv2,nwritten);
 379                 SSVAL(outbuf,smb_vwv4,(nwritten>>16)&1);
 380                 if (nwritten < (ssize_t)numtowrite) {
 381                         SCVAL(outbuf,smb_rcls,ERRHRD);
 382                         SSVAL(outbuf,smb_err,ERRdiskfull);
 383                 }
 384
 385                 DEBUG(3,("handle_aio_write: %s, num=%d wrote=%d\n",
 386                          fsp_fnum_dbg(fsp), (int)numtowrite, (int)nwritten));
 387
 388                 fh_set_pos(aio_ex->fsp->fh, aio_ex->offset + nwritten);
 389         }
 390
 391         show_msg(outbuf);
 392         if (!smb1_srv_send(aio_ex->smbreq->xconn, outbuf,
 393                           true, aio_ex->smbreq->seqnum+1,
 394                           IS_CONN_ENCRYPTED(fsp->conn),
 395                           NULL)) {
 396                 exit_server_cleanly("handle_aio_write_complete: "
 397                                     "smb1_srv_send failed.");
 398         }
 399
 400         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         TALLOC_FREE(aio_ex);
 406 }