lib/ext2fs/dupfs.c

   1 /*
   2  * dupfs.c --- duplicate a ext2 filesystem handle
   3  *
   4  * Copyright (C) 1997, 1998, 2001, 2003, 2005 by Theodore Ts'o.
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the GNU Library
   8  * General Public License, version 2.
   9  * %End-Header%
  10  */
  11
  12 #include "config.h"
  13 #include <stdio.h>
  14 #if HAVE_UNISTD_H
  15 #include <unistd.h>
  16 #endif
  17 #include <time.h>
  18 #include <string.h>
  19
  20 #include "ext2_fs.h"
  21 #include "ext2fsP.h"
  22
  23 errcode_t ext2fs_dup_handle(ext2_filsys src, ext2_filsys *dest)
  24 {
  25         ext2_filsys     fs;
  26         errcode_t       retval;
  27
  28         EXT2_CHECK_MAGIC(src, EXT2_ET_MAGIC_EXT2FS_FILSYS);
  29
  30         retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
  31         if (retval)
  32                 return retval;
  33
  34         *fs = *src;
  35         fs->device_name = 0;
  36         fs->super = 0;
  37         fs->orig_super = 0;
  38         fs->group_desc = 0;
  39         fs->inode_map = 0;
  40         fs->block_map = 0;
  41         fs->badblocks = 0;
  42         fs->dblist = 0;
  43         fs->mmp_buf = 0;
  44         fs->mmp_cmp = 0;
  45         fs->mmp_fd = -1;
  46
  47         io_channel_bumpcount(fs->io);
  48         if (fs->icache)
  49                 fs->icache->refcount++;
  50
  51         retval = ext2fs_get_mem(strlen(src->device_name)+1, &fs->device_name);
  52         if (retval)
  53                 goto errout;
  54         strcpy(fs->device_name, src->device_name);
  55
  56         retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->super);
  57         if (retval)
  58                 goto errout;
  59         memcpy(fs->super, src->super, SUPERBLOCK_SIZE);
  60
  61         retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->orig_super);
  62         if (retval)
  63                 goto errout;
  64         memcpy(fs->orig_super, src->orig_super, SUPERBLOCK_SIZE);
  65
  66         retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
  67                                 &fs->group_desc);
  68         if (retval)
  69                 goto errout;
  70         memcpy(fs->group_desc, src->group_desc,
  71                (size_t) fs->desc_blocks * fs->blocksize);
  72
  73         if (src->inode_map) {
  74                 retval = ext2fs_copy_bitmap(src->inode_map, &fs->inode_map);
  75                 if (retval)
  76                         goto errout;
  77         }
  78         if (src->block_map) {
  79                 retval = ext2fs_copy_bitmap(src->block_map, &fs->block_map);
  80                 if (retval)
  81                         goto errout;
  82         }
  83         if (src->badblocks) {
  84                 retval = ext2fs_badblocks_copy(src->badblocks, &fs->badblocks);
  85                 if (retval)
  86                         goto errout;
  87         }
  88         if (src->dblist) {
  89                 retval = ext2fs_copy_dblist(src->dblist, &fs->dblist);
  90                 if (retval)
  91                         goto errout;
  92         }
  93         if (src->mmp_buf) {
  94                 retval = ext2fs_get_mem(src->blocksize, &fs->mmp_buf);
  95                 if (retval)
  96                         goto errout;
  97                 memcpy(fs->mmp_buf, src->mmp_buf, src->blocksize);
  98         }
  99         if (src->mmp_fd >= 0) {
 100                 fs->mmp_fd = dup(src->mmp_fd);
 101                 if (fs->mmp_fd < 0) {
 102                         retval = EXT2_ET_MMP_OPEN_DIRECT;
 103                         goto errout;
 104                 }
 105         }
 106         if (src->mmp_cmp) {
 107                 int align = ext2fs_get_dio_alignment(src->mmp_fd);
 108
 109                 retval = ext2fs_get_memalign(src->blocksize, align,
 110                                              &fs->mmp_cmp);
 111                 if (retval)
 112                         goto errout;
 113                 memcpy(fs->mmp_cmp, src->mmp_cmp, src->blocksize);
 114         }
 115         *dest = fs;
 116         return 0;
 117 errout:
 118         ext2fs_free(fs);
 119         return retval;
 120
 121 }
 122