freefs.c revision a0553c9d6e8dd6f538f18ae447c45e52f3c40eb6 
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
20static void ext2fs_free_inode_cache(struct ext2_inode_cache *icache);
21
22void 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 */
64static 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 */
79void 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
90void 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 */
99void 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
113