source3/lib/file_id.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    file_id structure handling
   5
   6    Copyright (C) Andrew Tridgell 2007
   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 #include "includes.h"
  23
  24 /*
  25   return True if two file_id structures are equal
  26  */
  27 bool file_id_equal(const struct file_id *id1, const struct file_id *id2)
  28 {
  29         return id1->inode == id2->inode && id1->devid == id2->devid &&
  30             id1->extid == id2->extid;
  31 }
  32
  33 /*
  34   a static string for a file_id structure
  35  */
  36 const char *file_id_string_tos(const struct file_id *id)
  37 {
  38         char *result = talloc_asprintf(talloc_tos(), "%llx:%llx:%llx",
  39                                        (unsigned long long)id->devid,
  40                                        (unsigned long long)id->inode,
  41                                        (unsigned long long)id->extid);
  42         SMB_ASSERT(result != NULL);
  43         return result;
  44 }
  45
  46 /*
  47   push a 16 byte version of a file id into a buffer.  This ignores the extid
  48   and is needed when dev/inodes are stored in persistent storage (tdbs).
  49  */
  50 void push_file_id_16(char *buf, const struct file_id *id)
  51 {
  52         SIVAL(buf,  0, id->devid&0xFFFFFFFF);
  53         SIVAL(buf,  4, id->devid>>32);
  54         SIVAL(buf,  8, id->inode&0xFFFFFFFF);
  55         SIVAL(buf, 12, id->inode>>32);
  56 }
  57
  58 /*
  59   push a 24 byte version of a file id into a buffer
  60  */
  61 void push_file_id_24(char *buf, const struct file_id *id)
  62 {
  63         SIVAL(buf,  0, id->devid&0xFFFFFFFF);
  64         SIVAL(buf,  4, id->devid>>32);
  65         SIVAL(buf,  8, id->inode&0xFFFFFFFF);
  66         SIVAL(buf, 12, id->inode>>32);
  67         SIVAL(buf, 16, id->extid&0xFFFFFFFF);
  68         SIVAL(buf, 20, id->extid>>32);
  69 }
  70
  71 /*
  72   pull a 24 byte version of a file id from a buffer
  73  */
  74 void pull_file_id_24(char *buf, struct file_id *id)
  75 {
  76         ZERO_STRUCTP(id);
  77         id->devid  = IVAL(buf,  0);
  78         id->devid |= ((uint64_t)IVAL(buf,4))<<32;
  79         id->inode  = IVAL(buf,  8);
  80         id->inode |= ((uint64_t)IVAL(buf,12))<<32;
  81         id->extid  = IVAL(buf,  16);
  82         id->extid |= ((uint64_t)IVAL(buf,20))<<32;
  83 }