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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