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tst_libext2fs: Avoid multiple definition of global variables
[tools/e2fsprogs.git] / lib / ext2fs / i_block.c
1 /*
2  * i_block.c --- Manage the i_block field for i_blocks
3  *
4  * Copyright (C) 2008 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 <time.h>
18 #include <string.h>
19 #if HAVE_SYS_STAT_H
20 #include <sys/stat.h>
21 #endif
22 #if HAVE_SYS_TYPES_H
23 #include <sys/types.h>
24 #endif
25 #include <errno.h>
26
27 #include "ext2_fs.h"
28 #include "ext2fs.h"
29
30 errcode_t ext2fs_iblk_add_blocks(ext2_filsys fs, struct ext2_inode *inode,
31                                  blk64_t num_blocks)
32 {
33         unsigned long long b = inode->i_blocks;
34
35         if (ext2fs_has_feature_huge_file(fs->super))
36                 b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32;
37
38         if (!ext2fs_has_feature_huge_file(fs->super) ||
39             !(inode->i_flags & EXT4_HUGE_FILE_FL))
40             num_blocks *= fs->blocksize / 512;
41         num_blocks *= EXT2FS_CLUSTER_RATIO(fs);
42
43         b += num_blocks;
44
45         if (ext2fs_has_feature_huge_file(fs->super))
46                 inode->osd2.linux2.l_i_blocks_hi = b >> 32;
47         else if (b > 0xFFFFFFFF)
48                 return EOVERFLOW;
49         inode->i_blocks = b & 0xFFFFFFFF;
50         return 0;
51 }
52
53 errcode_t ext2fs_iblk_sub_blocks(ext2_filsys fs, struct ext2_inode *inode,
54                                  blk64_t num_blocks)
55 {
56         unsigned long long b = inode->i_blocks;
57
58         if (ext2fs_has_feature_huge_file(fs->super))
59                 b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32;
60
61         if (!ext2fs_has_feature_huge_file(fs->super) ||
62             !(inode->i_flags & EXT4_HUGE_FILE_FL))
63             num_blocks *= fs->blocksize / 512;
64         num_blocks *= EXT2FS_CLUSTER_RATIO(fs);
65
66         if (num_blocks > b)
67                 return EOVERFLOW;
68
69         b -= num_blocks;
70
71         if (ext2fs_has_feature_huge_file(fs->super))
72                 inode->osd2.linux2.l_i_blocks_hi = b >> 32;
73         inode->i_blocks = b & 0xFFFFFFFF;
74         return 0;
75 }
76
77 errcode_t ext2fs_iblk_set(ext2_filsys fs, struct ext2_inode *inode, blk64_t b)
78 {
79         if (!ext2fs_has_feature_huge_file(fs->super) ||
80             !(inode->i_flags & EXT4_HUGE_FILE_FL))
81                 b *= fs->blocksize / 512;
82         b *= EXT2FS_CLUSTER_RATIO(fs);
83
84         inode->i_blocks = b & 0xFFFFFFFF;
85         if (ext2fs_has_feature_huge_file(fs->super))
86                 inode->osd2.linux2.l_i_blocks_hi = b >> 32;
87         else if (b >> 32)
88                 return EOVERFLOW;
89         return 0;
90 }