source3/smbd/smb2_flush.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Core SMB2 server
   4
   5    Copyright (C) Stefan Metzmacher 2009
   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 "../libcli/smb/smb_common.h"
  25 #include "../lib/util/tevent_ntstatus.h"
  26
  27 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
  28                                                struct tevent_context *ev,
  29                                                struct smbd_smb2_request *smb2req,
  30                                                struct files_struct *fsp);
  31 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req);
  32
  33 static void smbd_smb2_request_flush_done(struct tevent_req *subreq);
  34 NTSTATUS smbd_smb2_request_process_flush(struct smbd_smb2_request *req)
  35 {
  36         NTSTATUS status;
  37         const uint8_t *inbody;
  38         uint64_t in_file_id_persistent;
  39         uint64_t in_file_id_volatile;
  40         struct files_struct *in_fsp;
  41         struct tevent_req *subreq;
  42
  43         status = smbd_smb2_request_verify_sizes(req, 0x18);
  44         if (!NT_STATUS_IS_OK(status)) {
  45                 return smbd_smb2_request_error(req, status);
  46         }
  47         inbody = SMBD_SMB2_IN_BODY_PTR(req);
  48
  49         in_file_id_persistent   = BVAL(inbody, 0x08);
  50         in_file_id_volatile     = BVAL(inbody, 0x10);
  51
  52         in_fsp = file_fsp_smb2(req, in_file_id_persistent, in_file_id_volatile);
  53         if (in_fsp == NULL) {
  54                 return smbd_smb2_request_error(req, NT_STATUS_FILE_CLOSED);
  55         }
  56
  57         subreq = smbd_smb2_flush_send(req, req->sconn->ev_ctx,
  58                                       req, in_fsp);
  59         if (subreq == NULL) {
  60                 return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  61         }
  62         tevent_req_set_callback(subreq, smbd_smb2_request_flush_done, req);
  63
  64         return smbd_smb2_request_pending_queue(req, subreq, 500);
  65 }
  66
  67 static void smbd_smb2_request_flush_done(struct tevent_req *subreq)
  68 {
  69         struct smbd_smb2_request *req = tevent_req_callback_data(subreq,
  70                                         struct smbd_smb2_request);
  71         DATA_BLOB outbody;
  72         NTSTATUS status;
  73         NTSTATUS error; /* transport error */
  74
  75         status = smbd_smb2_flush_recv(subreq);
  76         TALLOC_FREE(subreq);
  77         if (!NT_STATUS_IS_OK(status)) {
  78                 error = smbd_smb2_request_error(req, status);
  79                 if (!NT_STATUS_IS_OK(error)) {
  80                         smbd_server_connection_terminate(req->xconn,
  81                                                          nt_errstr(error));
  82                         return;
  83                 }
  84                 return;
  85         }
  86
  87         outbody = smbd_smb2_generate_outbody(req, 0x04);
  88         if (outbody.data == NULL) {
  89                 error = smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
  90                 if (!NT_STATUS_IS_OK(error)) {
  91                         smbd_server_connection_terminate(req->xconn,
  92                                                          nt_errstr(error));
  93                         return;
  94                 }
  95                 return;
  96         }
  97
  98         SSVAL(outbody.data, 0x00, 0x04);        /* struct size */
  99         SSVAL(outbody.data, 0x02, 0);           /* reserved */
 100
 101         error = smbd_smb2_request_done(req, outbody, NULL);
 102         if (!NT_STATUS_IS_OK(error)) {
 103                 smbd_server_connection_terminate(req->xconn,
 104                                                  nt_errstr(error));
 105                 return;
 106         }
 107 }
 108
 109 struct smbd_smb2_flush_state {
 110         struct smbd_smb2_request *smb2req;
 111 };
 112
 113 static void smbd_smb2_flush_done(struct tevent_req *subreq);
 114
 115 static struct tevent_req *smbd_smb2_flush_send(TALLOC_CTX *mem_ctx,
 116                                                struct tevent_context *ev,
 117                                                struct smbd_smb2_request *smb2req,
 118                                                struct files_struct *fsp)
 119 {
 120         struct tevent_req *req;
 121         struct tevent_req *subreq;
 122         struct smbd_smb2_flush_state *state;
 123         struct smb_request *smbreq;
 124         int ret;
 125
 126         req = tevent_req_create(mem_ctx, &state,
 127                                 struct smbd_smb2_flush_state);
 128         if (req == NULL) {
 129                 return NULL;
 130         }
 131         state->smb2req = smb2req;
 132
 133         DEBUG(10,("smbd_smb2_flush: %s - %s\n",
 134                   fsp_str_dbg(fsp), fsp_fnum_dbg(fsp)));
 135
 136         smbreq = smbd_smb2_fake_smb_request(smb2req);
 137         if (tevent_req_nomem(smbreq, req)) {
 138                 return tevent_req_post(req, ev);
 139         }
 140
 141         if (IS_IPC(smbreq->conn)) {
 142                 tevent_req_nterror(req, NT_STATUS_NOT_IMPLEMENTED);
 143                 return tevent_req_post(req, ev);
 144         }
 145
 146         if (!CHECK_WRITE(fsp)) {
 147                 tevent_req_nterror(req, NT_STATUS_ACCESS_DENIED);
 148                 return tevent_req_post(req, ev);
 149         }
 150
 151         if (fsp->fh->fd == -1) {
 152                 tevent_req_nterror(req, NT_STATUS_INVALID_HANDLE);
 153                 return tevent_req_post(req, ev);
 154         }
 155
 156         if (!lp_strict_sync(SNUM(smbreq->conn))) {
 157                 /*
 158                  * No strict sync. Don't really do
 159                  * anything here.
 160                  */
 161                 tevent_req_done(req);
 162                 return tevent_req_post(req, ev);
 163         }
 164
 165         ret = flush_write_cache(fsp, SAMBA_SYNC_FLUSH);
 166         if (ret == -1) {
 167                 tevent_req_nterror(req,  map_nt_error_from_unix(errno));
 168                 return tevent_req_post(req, ev);
 169         }
 170
 171         subreq = SMB_VFS_FSYNC_SEND(state, ev, fsp);
 172         if (tevent_req_nomem(subreq, req)) {
 173                 return tevent_req_post(req, ev);
 174         }
 175
 176         tevent_req_set_callback(subreq, smbd_smb2_flush_done, req);
 177
 178         /* Ensure any close request knows about this outstanding IO. */
 179         if (!aio_add_req_to_fsp(fsp, req)) {
 180                 tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
 181                 return tevent_req_post(req, ev);
 182         }
 183
 184         increment_outstanding_aio_calls();
 185         return req;
 186
 187 }
 188
 189 static void smbd_smb2_flush_done(struct tevent_req *subreq)
 190 {
 191         struct tevent_req *req = tevent_req_callback_data(
 192                 subreq, struct tevent_req);
 193         int ret, err;
 194
 195         decrement_outstanding_aio_calls();
 196
 197         ret = SMB_VFS_FSYNC_RECV(subreq, &err);
 198         TALLOC_FREE(subreq);
 199         if (ret == -1) {
 200                 tevent_req_error(req, err);
 201                 return;
 202         }
 203         tevent_req_done(req);
 204 }
 205
 206 static NTSTATUS smbd_smb2_flush_recv(struct tevent_req *req)
 207 {
 208         NTSTATUS status;
 209
 210         if (tevent_req_is_nterror(req, &status)) {
 211                 tevent_req_received(req);
 212                 return status;
 213         }
 214
 215         tevent_req_received(req);
 216         return NT_STATUS_OK;
 217 }