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 Public
   8  * License.
   9  * %End-Header%
  10  */
  11
  12 #include <stdio.h>
  13 #if HAVE_UNISTD_H
  14 #include <unistd.h>
  15 #endif
  16
  17 #include <linux/ext2_fs.h>
  18
  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->io) {
  28                 io_channel_close(fs->io);
  29         }
  30         if (fs->device_name)
  31                 ext2fs_free_mem((void **) &fs->device_name);
  32         if (fs->super)
  33                 ext2fs_free_mem((void **) &fs->super);
  34         if (fs->group_desc)
  35                 ext2fs_free_mem((void **) &fs->group_desc);
  36         if (fs->block_map)
  37                 ext2fs_free_block_bitmap(fs->block_map);
  38         if (fs->inode_map)
  39                 ext2fs_free_inode_bitmap(fs->inode_map);
  40
  41         if (fs->badblocks)
  42                 badblocks_list_free(fs->badblocks);
  43         fs->badblocks = 0;
  44
  45         if (fs->dblist)
  46                 ext2fs_free_dblist(fs->dblist);
  47
  48         if (fs->icache)
  49                 ext2fs_free_inode_cache(fs->icache);
  50
  51         fs->magic = 0;
  52
  53         ext2fs_free_mem((void **) &fs);
  54 }
  55
  56 void ext2fs_free_generic_bitmap(ext2fs_inode_bitmap bitmap)
  57 {
  58         if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_GENERIC_BITMAP))
  59                 return;
  60
  61         bitmap->magic = 0;
  62         if (bitmap->description) {
  63                 ext2fs_free_mem((void **) &bitmap->description);
  64                 bitmap->description = 0;
  65         }
  66         if (bitmap->bitmap) {
  67                 ext2fs_free_mem((void **) &bitmap->bitmap);
  68                 bitmap->bitmap = 0;
  69         }
  70         ext2fs_free_mem((void **) &bitmap);
  71 }
  72
  73 void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
  74 {
  75         if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_INODE_BITMAP))
  76                 return;
  77
  78         bitmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
  79         ext2fs_free_generic_bitmap(bitmap);
  80 }
  81
  82 void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
  83 {
  84         if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_BLOCK_BITMAP))
  85                 return;
  86
  87         bitmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
  88         ext2fs_free_generic_bitmap(bitmap);
  89 }
  90
  91 /*
  92  * Free the inode cache structure
  93  */
  94 static void ext2fs_free_inode_cache(struct ext2_inode_cache *icache)
  95 {
  96         if (--icache->refcount)
  97                 return;
  98         if (icache->buffer)
  99                 ext2fs_free_mem((void **) &icache->buffer);
 100         if (icache->cache)
 101                 ext2fs_free_mem((void **) &icache->cache);
 102         icache->buffer_blk = 0;
 103         ext2fs_free_mem((void **) &icache);
 104 }
 105
 106 /*
 107  * This procedure frees a badblocks list.
 108  */
 109 void ext2fs_badblocks_list_free(ext2_badblocks_list bb)
 110 {
 111         if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
 112                 return;
 113
 114         if (bb->list)
 115                 ext2fs_free_mem((void **) &bb->list);
 116         bb->list = 0;
 117         ext2fs_free_mem((void **) &bb);
 118 }
 119
 120 /*
 121  * Free a directory block list
 122  */
 123 void ext2fs_free_dblist(ext2_dblist dblist)
 124 {
 125         if (!dblist || (dblist->magic != EXT2_ET_MAGIC_DBLIST))
 126                 return;
 127
 128         if (dblist->list)
 129                 ext2fs_free_mem((void **) &dblist->list);
 130         dblist->list = 0;
 131         if (dblist->fs && dblist->fs->dblist == dblist)
 132                 dblist->fs->dblist = 0;
 133         dblist->magic = 0;
 134         ext2fs_free_mem((void **) &dblist);
 135 }
 136