source/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 a file_id which gives a unique ID for a file given the device and
  26   inode numbers
  27  */
  28 struct file_id file_id_create_dev(SMB_DEV_T dev, SMB_INO_T inode)
  29 {
  30         struct file_id key;
  31         /* the ZERO_STRUCT ensures padding doesn't break using the key as a
  32          * blob */
  33         ZERO_STRUCT(key);
  34         key.devid = dev;
  35         key.inode = inode;
  36         return key;
  37 }
  38
  39 /*
  40   generate a file_id from a stat structure
  41  */
  42 struct file_id vfs_file_id_from_sbuf(connection_struct *conn, const SMB_STRUCT_STAT *sbuf)
  43 {
  44         return SMB_VFS_FILE_ID_CREATE(conn, sbuf->st_dev, sbuf->st_ino);
  45 }
  46
  47 /*
  48   return True if two file_id structures are equal
  49  */
  50 bool file_id_equal(const struct file_id *id1, const struct file_id *id2)
  51 {
  52         return id1->inode == id2->inode && id1->devid == id2->devid;
  53 }
  54
  55 /*
  56   a static string for a file_id structure
  57  */
  58 const char *file_id_string_tos(const struct file_id *id)
  59 {
  60         char *result = talloc_asprintf(talloc_tos(), "%llx:%llx",
  61                                        (unsigned long long)id->devid,
  62                                        (unsigned long long)id->inode);
  63         SMB_ASSERT(result != NULL);
  64         return result;
  65 }
  66
  67 /*
  68   push a 16 byte version of a file id into a buffer
  69  */
  70 void push_file_id_16(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 }
  77
  78 /*
  79   pul a 16 byte version of a file id from a buffer
  80  */
  81 void pull_file_id_16(char *buf, struct file_id *id)
  82 {
  83         ZERO_STRUCTP(id);
  84         id->devid  = IVAL(buf,  0);
  85         id->devid |= ((uint64_t)IVAL(buf,4))<<32;
  86         id->inode  = IVAL(buf,  8);
  87         id->inode |= ((uint64_t)IVAL(buf,12))<<32;
  88 }