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      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 "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 void ext2fs_free_generic_bitmap(ext2fs_inode_bitmap bitmap)
     62 {
     63 	if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_GENERIC_BITMAP))
     64 		return;
     65 
     66 	bitmap->magic = 0;
     67 	if (bitmap->description) {
     68 		ext2fs_free_mem(&bitmap->description);
     69 		bitmap->description = 0;
     70 	}
     71 	if (bitmap->bitmap) {
     72 		ext2fs_free_mem(&bitmap->bitmap);
     73 		bitmap->bitmap = 0;
     74 	}
     75 	ext2fs_free_mem(&bitmap);
     76 }
     77 
     78 void ext2fs_free_inode_bitmap(ext2fs_inode_bitmap bitmap)
     79 {
     80 	if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_INODE_BITMAP))
     81 		return;
     82 
     83 	bitmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
     84 	ext2fs_free_generic_bitmap(bitmap);
     85 }
     86 
     87 void ext2fs_free_block_bitmap(ext2fs_block_bitmap bitmap)
     88 {
     89 	if (!bitmap || (bitmap->magic != EXT2_ET_MAGIC_BLOCK_BITMAP))
     90 		return;
     91 
     92 	bitmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP;
     93 	ext2fs_free_generic_bitmap(bitmap);
     94 }
     95 
     96 /*
     97  * Free the inode cache structure
     98  */
     99 static void ext2fs_free_inode_cache(struct ext2_inode_cache *icache)
    100 {
    101 	if (--icache->refcount)
    102 		return;
    103 	if (icache->buffer)
    104 		ext2fs_free_mem(&icache->buffer);
    105 	if (icache->cache)
    106 		ext2fs_free_mem(&icache->cache);
    107 	icache->buffer_blk = 0;
    108 	ext2fs_free_mem(&icache);
    109 }
    110 
    111 /*
    112  * This procedure frees a badblocks list.
    113  */
    114 void ext2fs_u32_list_free(ext2_u32_list bb)
    115 {
    116 	if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
    117 		return;
    118 
    119 	if (bb->list)
    120 		ext2fs_free_mem(&bb->list);
    121 	bb->list = 0;
    122 	ext2fs_free_mem(&bb);
    123 }
    124 
    125 void ext2fs_badblocks_list_free(ext2_badblocks_list bb)
    126 {
    127 	ext2fs_u32_list_free((ext2_u32_list) bb);
    128 }
    129 
    130 
    131 /*
    132  * Free a directory block list
    133  */
    134 void ext2fs_free_dblist(ext2_dblist dblist)
    135 {
    136 	if (!dblist || (dblist->magic != EXT2_ET_MAGIC_DBLIST))
    137 		return;
    138 
    139 	if (dblist->list)
    140 		ext2fs_free_mem(&dblist->list);
    141 	dblist->list = 0;
    142 	if (dblist->fs && dblist->fs->dblist == dblist)
    143 		dblist->fs->dblist = 0;
    144 	dblist->magic = 0;
    145 	ext2fs_free_mem(&dblist);
    146 }
    147 
    148