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 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 #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 */
ext2fs_inode_has_valid_blocks2(ext2_filsys fs,struct ext2_inode * inode)27 int ext2fs_inode_has_valid_blocks2(ext2_filsys fs, 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 (ext2fs_file_acl_block(fs, inode) == 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
56 /*
57 * If this inode has inline data, it shouldn't have valid block
58 * entries.
59 */
60 if (inode->i_flags & EXT4_INLINE_DATA_FL)
61 return 0;
62 return 1;
63 }
64
ext2fs_inode_has_valid_blocks(struct ext2_inode * inode)65 int ext2fs_inode_has_valid_blocks(struct ext2_inode *inode)
66 {
67 return ext2fs_inode_has_valid_blocks2(NULL, inode);
68 }
69