source3/include/locking.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB parameters and setup, plus a whole lot more.
   4
   5    Copyright (C) Jeremy Allison   2006
   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 #ifndef _LOCKING_H
  22 #define _LOCKING_H
  23
  24 /* passed to br lock code - the UNLOCK_LOCK should never be stored into the tdb
  25    and is used in calculating POSIX unlock ranges only. We differentiate between
  26    PENDING read and write locks to allow posix lock downgrades to trigger a lock
  27    re-evaluation. */
  28
  29 enum brl_type {READ_LOCK, WRITE_LOCK, UNLOCK_LOCK};
  30 enum brl_flavour {WINDOWS_LOCK = 0, POSIX_LOCK = 1};
  31
  32 #include "librpc/gen_ndr/server_id.h"
  33
  34 /* This contains elements that differentiate locks. The smbpid is a
  35    client supplied pid, and is essentially the locking context for
  36    this client */
  37
  38 struct lock_context {
  39         uint64_t smblctx;
  40         uint32_t tid;
  41         struct server_id pid;
  42 };
  43
  44 struct files_struct;
  45
  46 #include "lib/file_id.h"
  47
  48 struct byte_range_lock;
  49
  50 /* Internal structure in brlock.tdb.
  51    The data in brlock records is an unsorted linear array of these
  52    records.  It is unnecessary to store the count as tdb provides the
  53    size of the record */
  54
  55 struct lock_struct {
  56         struct lock_context context;
  57         br_off start;
  58         br_off size;
  59         uint64_t fnum;
  60         enum brl_type lock_type;
  61         enum brl_flavour lock_flav;
  62 };
  63
  64 struct smbd_lock_element {
  65         uint64_t smblctx;
  66         enum brl_type brltype;
  67         uint64_t offset;
  68         uint64_t count;
  69 };
  70
  71 struct share_mode_lock {
  72         struct share_mode_data *data;
  73 };
  74
  75 #endif /* _LOCKING_H_ */