source3/locking/leases_util.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Lease utility functions
   4
   5    Copyright (C) Jeremy Allison 2017.
   6    Copyright (C) Stefan (metze) Metzmacher 2017.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #define DBGC_CLASS DBGC_LOCKING
  23 #include "includes.h"
  24 #include "../librpc/gen_ndr/open_files.h"
  25 #include "locking/proto.h"
  26
  27 uint32_t map_oplock_to_lease_type(uint16_t op_type)
  28 {
  29         uint32_t ret;
  30
  31         switch(op_type) {
  32         case BATCH_OPLOCK:
  33         case BATCH_OPLOCK|EXCLUSIVE_OPLOCK:
  34                 ret = SMB2_LEASE_READ|SMB2_LEASE_WRITE|SMB2_LEASE_HANDLE;
  35                 break;
  36         case EXCLUSIVE_OPLOCK:
  37                 ret = SMB2_LEASE_READ|SMB2_LEASE_WRITE;
  38                 break;
  39         case LEVEL_II_OPLOCK:
  40                 ret = SMB2_LEASE_READ;
  41                 break;
  42         default:
  43                 ret = SMB2_LEASE_NONE;
  44                 break;
  45         }
  46         return ret;
  47 }
  48
  49 uint32_t fsp_lease_type(const struct files_struct *fsp)
  50 {
  51         if (fsp->oplock_type == LEASE_OPLOCK) {
  52                 return fsp->lease->lease.lease_state;
  53         }
  54         return map_oplock_to_lease_type(fsp->oplock_type);
  55 }
  56
  57 uint32_t lease_type_is_exclusive(uint32_t lease_type)
  58 {
  59         if ((lease_type & (SMB2_LEASE_READ | SMB2_LEASE_WRITE)) ==
  60             (SMB2_LEASE_READ | SMB2_LEASE_WRITE)) {
  61                 return true;
  62         }
  63
  64         return false;
  65 }
  66
  67 bool fsp_lease_type_is_exclusive(const struct files_struct *fsp)
  68 {
  69         uint32_t lease_type = fsp_lease_type(fsp);
  70
  71         return lease_type_is_exclusive(lease_type);
  72 }