/src/e2fsprogs/lib/ext2fs/valid_blk.c
Line | Count | Source |
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 | | */ |
27 | | int ext2fs_inode_has_valid_blocks2(ext2_filsys fs, struct ext2_inode *inode) |
28 | 0 | { |
29 | | /* |
30 | | * Only directories, regular files, and some symbolic links |
31 | | * have valid block entries. |
32 | | */ |
33 | 0 | if (!LINUX_S_ISDIR(inode->i_mode) && !LINUX_S_ISREG(inode->i_mode) && |
34 | 0 | !LINUX_S_ISLNK(inode->i_mode)) |
35 | 0 | 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 | 0 | if (LINUX_S_ISLNK (inode->i_mode)) { |
42 | 0 | if (ext2fs_file_acl_block(fs, inode) == 0) { |
43 | | /* With no EA block, we can rely on i_blocks */ |
44 | 0 | if (inode->i_blocks == 0) |
45 | 0 | return 0; |
46 | 0 | return !ext2fs_is_fast_symlink(inode); |
47 | 0 | } else { |
48 | | /* With an EA block, life gets more tricky */ |
49 | 0 | if (inode->i_size >= EXT2_N_BLOCKS*4) |
50 | 0 | return 1; /* definitely using i_block[] */ |
51 | 0 | if (inode->i_size > 4 && inode->i_block[1] == 0) |
52 | 0 | return 1; /* definitely using i_block[] */ |
53 | 0 | return 0; /* Probably a fast symlink */ |
54 | 0 | } |
55 | 0 | } |
56 | | |
57 | | /* |
58 | | * If this inode has inline data, it shouldn't have valid block |
59 | | * entries. |
60 | | */ |
61 | 0 | if (inode->i_flags & EXT4_INLINE_DATA_FL) |
62 | 0 | return 0; |
63 | 0 | return 1; |
64 | 0 | } |
65 | | |
66 | | int ext2fs_inode_has_valid_blocks(struct ext2_inode *inode) |
67 | 0 | { |
68 | | return ext2fs_inode_has_valid_blocks2(NULL, inode); |
69 | 0 | } |