freefs.c revision 496220309337863b45d9ee6173ff431919fb51f5 
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
21static void ext2fs_free_inode_cache(struct ext2_inode_cache *icache);
22
23void 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	if (fs->image_header)
47		ext2fs_free_mem(&fs->image_header);
48
49	if (fs->badblocks)
50		ext2fs_badblocks_list_free(fs->badblocks);
51	fs->badblocks = 0;
52
53	if (fs->dblist)
54		ext2fs_free_dblist(fs->dblist);
55
56	if (fs->icache)
57		ext2fs_free_inode_cache(fs->icache);
58
59	if (fs->mmp_buf)
60		ext2fs_free_mem(&fs->mmp_buf);
61	if (fs->mmp_cmp)
62		ext2fs_free_mem(&fs->mmp_cmp);
63
64	fs->magic = 0;
65
66	ext2fs_free_mem(&fs);
67}
68
69/*
70 * Free the inode cache structure
71 */
72static void ext2fs_free_inode_cache(struct ext2_inode_cache *icache)
73{
74	if (--icache->refcount)
75		return;
76	if (icache->buffer)
77		ext2fs_free_mem(&icache->buffer);
78	if (icache->cache)
79		ext2fs_free_mem(&icache->cache);
80	icache->buffer_blk = 0;
81	ext2fs_free_mem(&icache);
82}
83
84/*
85 * This procedure frees a badblocks list.
86 */
87void ext2fs_u32_list_free(ext2_u32_list bb)
88{
89	if (bb->magic != EXT2_ET_MAGIC_BADBLOCKS_LIST)
90		return;
91
92	if (bb->list)
93		ext2fs_free_mem(&bb->list);
94	bb->list = 0;
95	ext2fs_free_mem(&bb);
96}
97
98void ext2fs_badblocks_list_free(ext2_badblocks_list bb)
99{
100	ext2fs_u32_list_free((ext2_u32_list) bb);
101}
102
103
104/*
105 * Free a directory block list
106 */
107void ext2fs_free_dblist(ext2_dblist dblist)
108{
109	if (!dblist || (dblist->magic != EXT2_ET_MAGIC_DBLIST))
110		return;
111
112	if (dblist->list)
113		ext2fs_free_mem(&dblist->list);
114	dblist->list = 0;
115	if (dblist->fs && dblist->fs->dblist == dblist)
116		dblist->fs->dblist = 0;
117	dblist->magic = 0;
118	ext2fs_free_mem(&dblist);
119}
120
121