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 "config.h"
  13 #include <stdio.h>
  14 #if HAVE_UNISTD_H
  15 #include <unistd.h>
  16 #endif
  17
  18 #include "ext2_fs.h"
  19 #include "ext2fsP.h"
  20
  21 static void ext2fs_free_inode_cache(struct ext2_inode_cache *icache);
  22
  23 void ext2fs_free(ext2_filsys fs)
  24 {
  25         if (!fs || (fs->magic != EXT2_ET_MAGIC_EXT2FS_FILSYS))
  26                 return;
  27         if (fs->image_io != fs->io) {
  28                 if (fs->image_io)
  29                         io_channel_close(fs->image_io);
  30         }
  31         if (fs->io) {
  32                 io_channel_close(fs->io);
  33         }
  34         if (fs->device_name)
  35                 ext2fs_free_mem(&fs->device_name);
  36         if (fs->super)
  37                 ext2fs_free_mem(&fs->super);
  38         if (fs->orig_super)
  39                 ext2fs_free_mem(&fs->orig_super);
  40         if (fs->group_desc)
  41                 ext2fs_free_mem(&fs->group_desc);
  42         if (fs->block_map)
  43                 ext2fs_free_block_bitmap(fs->block_map);
  44         if (fs->inode_map)
  45                 ext2fs_free_inode_bitmap(fs->inode_map);
  46
  47         if (fs->badblocks)
  48                 ext2fs_badblocks_list_free(fs->badblocks);
  49         fs->badblocks = 0;
  50
  51         if (fs->dblist)
  52                 ext2fs_free_dblist(fs->dblist);
  53
  54         if (fs->icache)
  55                 ext2fs_free_inode_cache(fs->icache);
  56
  57         fs->magic = 0;
  58
  59         ext2fs_free_mem(&fs);
  60 }
  61
  62 /*
  63  * Free the inode cache structure
  64  */
  65 static void ext2fs_free_inode_cache(struct ext2_inode_cache *icache)
  66 {
  67         if (--icache->refcount)
  68                 return;
  69         if (icache->buffer)
  70                 ext2fs_free_mem(&icache->buffer);
  71         if (icache->cache)
  72                 ext2fs_free_mem(&icache->cache);
  73         icache->buffer_blk = 0;
  74         ext2fs_free_mem(&icache);
  75 }
  76
  77 /*
  78  * This procedure frees a badblocks list.
  79  */
  80 void ext2fs_u32_list_free(ext2_u32_list bb)
  81 {
  82         if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
  83                 return;
  84
  85         if (bb->list)
  86                 ext2fs_free_mem(&bb->list);
  87         bb->list = 0;
  88         ext2fs_free_mem(&bb);
  89 }
  90
  91 void ext2fs_badblocks_list_free(ext2_badblocks_list bb)
  92 {
  93         ext2fs_u32_list_free((ext2_u32_list) bb);
  94 }
  95
  96
  97 /*
  98  * Free a directory block list
  99  */
 100 void ext2fs_free_dblist(ext2_dblist dblist)
 101 {
 102         if (!dblist || (dblist->magic != EXT2_ET_MAGIC_DBLIST))
 103                 return;
 104
 105         if (dblist->list)
 106                 ext2fs_free_mem(&dblist->list);
 107         dblist->list = 0;
 108         if (dblist->fs && dblist->fs->dblist == dblist)
 109                 dblist->fs->dblist = 0;
 110         dblist->magic = 0;
 111         ext2fs_free_mem(&dblist);
 112 }
 113