blob: fe5b6930b904cb03a4df28935fb8c90624526138 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/*
* i_block.c --- Manage the i_block field for i_blocks
*
* Copyright (C) 2008 Theodore Ts'o.
*
* %Begin-Header%
* This file may be redistributed under the terms of the GNU Library
* General Public License, version 2.
* %End-Header%
*/
#include <common.h>
//#include <ext_common.h>
//#include <ext4fs.h>
#include <malloc.h>
#include <stddef.h>
#include <linux/stat.h>
#include <linux/time.h>
#include "ext2_fs.h"
#include "ext2fs.h"
errcode_t ext2fs_iblk_add_blocks(ext2_filsys fs, struct ext2_inode *inode,
blk64_t num_blocks)
{
unsigned long long b = inode->i_blocks;
if (!(fs->super->s_feature_ro_compat &
EXT4_FEATURE_RO_COMPAT_HUGE_FILE) ||
!(inode->i_flags & EXT4_HUGE_FILE_FL))
num_blocks *= fs->blocksize / 512;
b += num_blocks;
if (fs->super->s_feature_ro_compat &
EXT4_FEATURE_RO_COMPAT_HUGE_FILE) {
b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32;
inode->osd2.linux2.l_i_blocks_hi = b >> 32;
} else if (b > 0xFFFFFFFF)
return EOVERFLOW;
inode->i_blocks = b & 0xFFFFFFFF;
return 0;
}
errcode_t ext2fs_iblk_sub_blocks(ext2_filsys fs, struct ext2_inode *inode,
blk64_t num_blocks)
{
unsigned long long b = inode->i_blocks;
if (!(fs->super->s_feature_ro_compat &
EXT4_FEATURE_RO_COMPAT_HUGE_FILE) ||
!(inode->i_flags & EXT4_HUGE_FILE_FL))
num_blocks *= fs->blocksize / 512;
if (num_blocks > b)
return EOVERFLOW;
b -= num_blocks;
if (fs->super->s_feature_ro_compat &
EXT4_FEATURE_RO_COMPAT_HUGE_FILE) {
b += ((long long) inode->osd2.linux2.l_i_blocks_hi) << 32;
inode->osd2.linux2.l_i_blocks_hi = b >> 32;
}
inode->i_blocks = b & 0xFFFFFFFF;
return 0;
}
errcode_t ext2fs_iblk_set(ext2_filsys fs, struct ext2_inode *inode, blk64_t b)
{
if (!(fs->super->s_feature_ro_compat &
EXT4_FEATURE_RO_COMPAT_HUGE_FILE) ||
!(inode->i_flags & EXT4_HUGE_FILE_FL))
b *= fs->blocksize / 512;
inode->i_blocks = b & 0xFFFFFFFF;
if (fs->super->s_feature_ro_compat & EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
inode->osd2.linux2.l_i_blocks_hi = b >> 32;
else if (b >> 32)
return EOVERFLOW;
return 0;
}
|
