lib/ext2fs/freefs.c

   1 /*
   2  * freefs.c --- free an ext2 filesystem
   3  *
   4  * Copyright (C) 1993, 1994, 1995, 1996 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 <stdio.h>
  13 #if HAVE_UNISTD_H
  14 #include <unistd.h>
  15 #endif
  16
  17 #include "ext2_fs.h"
  18 #include "ext2fsP.h"
  19
  20 static void ext2fs_free_inode_cache(struct ext2_inode_cache *icache);
  21
  22 void ext2fs_free(ext2_filsys fs)
  23 {
  24         if (!fs || (fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS))
  25                 return;
  26         if (fs->image_io != fs->io) {
  27                 if (fs->image_io)
  28                         io_channel_close(fs->image_io);
  29         }
  30         if (fs->io) {
  31                 io_channel_close(fs->io);
  32         }
  33         if (fs->device_name)
  34                 ext2fs_free_mem(&fs->device_name);
  35         if (fs->super)
  36                 ext2fs_free_mem(&fs->super);
  37         if (fs->orig_super)
  38                 ext2fs_free_mem(&fs->orig_super);
  39         if (fs->group_desc)
  40                 ext2fs_free_mem(&fs->group_desc);
  41         if (fs->block_map)
  42                 ext2fs_free_block_bitmap(fs->block_map);
  43         if (fs->inode_map)
  44                 ext2fs_free_inode_bitmap(fs->inode_map);
  45
  46         if (fs->badblocks)
  47                 ext2fs_badblocks_list_free(fs->badblocks);
  48         fs->badblocks = 0;
  49
  50         if (fs->dblist)
  51                 ext2fs_free_dblist(fs->dblist);
  52
  53         if (fs->icache)
  54                 ext2fs_free_inode_cache(fs->icache);
  55
  56         fs->magic = 0;
  57
  58         ext2fs_free_mem(&fs);
  59 }
  60
  61 /*
  62  * Free the inode cache structure
  63  */
  64 static void ext2fs_free_inode_cache(struct ext2_inode_cache *icache)
  65 {
  66         if (--icache->refcount)
  67                 return;
  68         if (icache->buffer)
  69                 ext2fs_free_mem(&icache->buffer);
  70         if (icache->cache)
  71                 ext2fs_free_mem(&icache->cache);
  72         icache->buffer_blk = 0;
  73         ext2fs_free_mem(&icache);
  74 }
  75
  76 /*
  77  * This procedure frees a badblocks list.
  78  */
  79 void ext2fs_u32_list_free(ext2_u32_list bb)
  80 {
  81         if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
  82                 return;
  83
  84         if (bb->list)
  85                 ext2fs_free_mem(&bb->list);
  86         bb->list = 0;
  87         ext2fs_free_mem(&bb);
  88 }
  89
  90 void ext2fs_badblocks_list_free(ext2_badblocks_list bb)
  91 {
  92         ext2fs_u32_list_free((ext2_u32_list) bb);
  93 }
  94
  95
  96 /*
  97  * Free a directory block list
  98  */
  99 void ext2fs_free_dblist(ext2_dblist dblist)
 100 {
 101         if (!dblist || (dblist->magic != EXT2_ET_MAGIC_DBLIST))
 102                 return;
 103
 104         if (dblist->list)
 105                 ext2fs_free_mem(&dblist->list);
 106         dblist->list = 0;
 107         if (dblist->fs && dblist->fs->dblist == dblist)
 108                 dblist->fs->dblist = 0;
 109         dblist->magic = 0;
 110         ext2fs_free_mem(&dblist);
 111 }
 112