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 <stdio.h>
13 #if HAVE_UNISTD_H
14 #include <unistd.h>
15 #endif
16 #include <string.h>
17 #include <time.h>
18
19 #include "ext2_fs.h"
20 #include "ext2fs.h"
21
22 /*
23 * This function returns 1 if the inode's block entries actually
24 * contain block entries.
25 */
ext2fs_inode_has_valid_blocks2(ext2_filsys fs,struct ext2_inode * inode)26 int ext2fs_inode_has_valid_blocks2(ext2_filsys fs, struct ext2_inode *inode)
27 {
28 /*
29 * Only directories, regular files, and some symbolic links
30 * have valid block entries.
31 */
32 if (!LINUX_S_ISDIR(inode->i_mode) && !LINUX_S_ISREG(inode->i_mode) &&
33 !LINUX_S_ISLNK(inode->i_mode))
34 return 0;
35
36 /*
37 * If the symbolic link is a "fast symlink", then the symlink
38 * target is stored in the block entries.
39 */
40 if (LINUX_S_ISLNK (inode->i_mode)) {
41 if (ext2fs_file_acl_block(fs, inode) == 0) {
42 /* With no EA block, we can rely on i_blocks */
43 if (inode->i_blocks == 0)
44 return 0;
45 } else {
46 /* With an EA block, life gets more tricky */
47 if (inode->i_size >= EXT2_N_BLOCKS*4)
48 return 1; /* definitely using i_block[] */
49 if (inode->i_size > 4 && inode->i_block[1] == 0)
50 return 1; /* definitely using i_block[] */
51 return 0; /* Probably a fast symlink */
52 }
53 }
54 return 1;
55 }
56
ext2fs_inode_has_valid_blocks(struct ext2_inode * inode)57 int ext2fs_inode_has_valid_blocks(struct ext2_inode *inode)
58 {
59 return ext2fs_inode_has_valid_blocks2(NULL, inode);
60 }
61