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 #include "lib/file_id.h"
  24
  25 /*
  26   return True if two file_id structures are equal
  27  */
  28 bool file_id_equal(const struct file_id *id1, const struct file_id *id2)
  29 {
  30         return id1->inode == id2->inode && id1->devid == id2->devid &&
  31             id1->extid == id2->extid;
  32 }
  33
  34 /*
  35   a static-like (on talloc_tos()) string for a file_id structure
  36  */
  37 const char *file_id_string_tos(const struct file_id *id)
  38 {
  39         return file_id_string(talloc_tos(), id);
  40 }
  41
  42 /*
  43   an allocated string for a file_id structure
  44  */
  45 const char *file_id_string(TALLOC_CTX *mem_ctx, const struct file_id *id)
  46 {
  47         char *result = talloc_asprintf(mem_ctx, "%llx:%llx:%llx",
  48                                        (unsigned long long)id->devid,
  49                                        (unsigned long long)id->inode,
  50                                        (unsigned long long)id->extid);
  51         SMB_ASSERT(result != NULL);
  52         return result;
  53 }
  54
  55 /*
  56   push a 16 byte version of a file id into a buffer.  This ignores the extid
  57   and is needed when dev/inodes are stored in persistent storage (tdbs).
  58  */
  59 void push_file_id_16(char *buf, const struct file_id *id)
  60 {
  61         SIVAL(buf,  0, id->devid&0xFFFFFFFF);
  62         SIVAL(buf,  4, id->devid>>32);
  63         SIVAL(buf,  8, id->inode&0xFFFFFFFF);
  64         SIVAL(buf, 12, id->inode>>32);
  65 }
  66
  67 /*
  68   push a 24 byte version of a file id into a buffer
  69  */
  70 void push_file_id_24(char *buf, const struct file_id *id)
  71 {
  72         SIVAL(buf,  0, id->devid&0xFFFFFFFF);
  73         SIVAL(buf,  4, id->devid>>32);
  74         SIVAL(buf,  8, id->inode&0xFFFFFFFF);
  75         SIVAL(buf, 12, id->inode>>32);
  76         SIVAL(buf, 16, id->extid&0xFFFFFFFF);
  77         SIVAL(buf, 20, id->extid>>32);
  78 }
  79
  80 /*
  81   pull a 24 byte version of a file id from a buffer
  82  */
  83 void pull_file_id_24(const char *buf, struct file_id *id)
  84 {
  85         ZERO_STRUCTP(id);
  86         id->devid  = IVAL(buf,  0);
  87         id->devid |= ((uint64_t)IVAL(buf,4))<<32;
  88         id->inode  = IVAL(buf,  8);
  89         id->inode |= ((uint64_t)IVAL(buf,12))<<32;
  90         id->extid  = IVAL(buf,  16);
  91         id->extid |= ((uint64_t)IVAL(buf,20))<<32;
  92 }