source: MondoRescue/branches/stable/mindi-busybox/e2fsprogs/ext2fs/valid_blk.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 13 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.3 KB
Line 
1/*
2 * valid_blk.c --- does the inode have valid blocks?
3 *
4 * Copyright 1997 by 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
13#include <stdio.h>
14#if HAVE_UNISTD_H
15#include <unistd.h>
16#endif
17#include <string.h>
18#include <time.h>
19
20#include "ext2_fs.h"
21#include "ext2fs.h"
22
23/*
24 * This function returns 1 if the inode's block entries actually
25 * contain block entries.
26 */
27int ext2fs_inode_has_valid_blocks(struct ext2_inode *inode)
28{
29    /*
30     * Only directories, regular files, and some symbolic links
31     * have valid block entries.
32     */
33    if (!LINUX_S_ISDIR(inode->i_mode) && !LINUX_S_ISREG(inode->i_mode) &&
34        !LINUX_S_ISLNK(inode->i_mode))
35        return 0;
36
37    /*
38     * If the symbolic link is a "fast symlink", then the symlink
39     * target is stored in the block entries.
40     */
41    if (LINUX_S_ISLNK (inode->i_mode)) {
42        if (inode->i_file_acl == 0) {
43            /* With no EA block, we can rely on i_blocks */
44            if (inode->i_blocks == 0)
45                return 0;
46        } else {
47            /* With an EA block, life gets more tricky */
48            if (inode->i_size >= EXT2_N_BLOCKS*4)
49                return 1; /* definitely using i_block[] */
50            if (inode->i_size > 4 && inode->i_block[1] == 0)
51                return 1; /* definitely using i_block[] */
52            return 0; /* Probably a fast symlink */
53        }
54    }
55    return 1;
56}
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