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 
ext2fs_free(ext2_filsys fs)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 	if (fs->image_header)
46 		ext2fs_free_mem(&fs->image_header);
47 
48 	if (fs->badblocks)
49 		ext2fs_badblocks_list_free(fs->badblocks);
50 	fs->badblocks = 0;
51 
52 	if (fs->dblist)
53 		ext2fs_free_dblist(fs->dblist);
54 
55 	if (fs->icache)
56 		ext2fs_free_inode_cache(fs->icache);
57 
58 	if (fs->mmp_buf)
59 		ext2fs_free_mem(&fs->mmp_buf);
60 	if (fs->mmp_cmp)
61 		ext2fs_free_mem(&fs->mmp_cmp);
62 
63 	fs->magic = 0;
64 
65 	ext2fs_free_mem(&fs);
66 }
67 
68 /*
69  * Free the inode cache structure
70  */
ext2fs_free_inode_cache(struct ext2_inode_cache * icache)71 static void ext2fs_free_inode_cache(struct ext2_inode_cache *icache)
72 {
73 	if (--icache->refcount)
74 		return;
75 	if (icache->buffer)
76 		ext2fs_free_mem(&icache->buffer);
77 	if (icache->cache)
78 		ext2fs_free_mem(&icache->cache);
79 	icache->buffer_blk = 0;
80 	ext2fs_free_mem(&icache);
81 }
82 
83 /*
84  * This procedure frees a badblocks list.
85  */
ext2fs_u32_list_free(ext2_u32_list bb)86 void ext2fs_u32_list_free(ext2_u32_list bb)
87 {
88 	if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
89 		return;
90 
91 	if (bb->list)
92 		ext2fs_free_mem(&bb->list);
93 	bb->list = 0;
94 	ext2fs_free_mem(&bb);
95 }
96 
ext2fs_badblocks_list_free(ext2_badblocks_list bb)97 void ext2fs_badblocks_list_free(ext2_badblocks_list bb)
98 {
99 	ext2fs_u32_list_free((ext2_u32_list) bb);
100 }
101 
102 
103 /*
104  * Free a directory block list
105  */
ext2fs_free_dblist(ext2_dblist dblist)106 void ext2fs_free_dblist(ext2_dblist dblist)
107 {
108 	if (!dblist || (dblist->magic != EXT2_ET_MAGIC_DBLIST))
109 		return;
110 
111 	if (dblist->list)
112 		ext2fs_free_mem(&dblist->list);
113 	dblist->list = 0;
114 	if (dblist->fs && dblist->fs->dblist == dblist)
115 		dblist->fs->dblist = 0;
116 	dblist->magic = 0;
117 	ext2fs_free_mem(&dblist);
118 }
119 
120