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1/*
2 * linux/fs/ext4/bitmap.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 */
9
10#include <linux/buffer_head.h>
11#include "ext4.h"
12
13unsigned int ext4_count_free(char *bitmap, unsigned int numchars)
14{
15 return numchars * BITS_PER_BYTE - memweight(bitmap, numchars);
16}
17
18int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
19 struct ext4_group_desc *gdp,
20 struct buffer_head *bh, int sz)
21{
22 __u32 hi;
23 __u32 provided, calculated;
24 struct ext4_sb_info *sbi = EXT4_SB(sb);
25
26 if (!ext4_has_metadata_csum(sb))
27 return 1;
28
29 provided = le16_to_cpu(gdp->bg_inode_bitmap_csum_lo);
30 calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
31 if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END) {
32 hi = le16_to_cpu(gdp->bg_inode_bitmap_csum_hi);
33 provided |= (hi << 16);
34 } else
35 calculated &= 0xFFFF;
36
37 return provided == calculated;
38}
39
40void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
41 struct ext4_group_desc *gdp,
42 struct buffer_head *bh, int sz)
43{
44 __u32 csum;
45 struct ext4_sb_info *sbi = EXT4_SB(sb);
46
47 if (!ext4_has_metadata_csum(sb))
48 return;
49
50 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
51 gdp->bg_inode_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
52 if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END)
53 gdp->bg_inode_bitmap_csum_hi = cpu_to_le16(csum >> 16);
54}
55
56int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
57 struct ext4_group_desc *gdp,
58 struct buffer_head *bh)
59{
60 __u32 hi;
61 __u32 provided, calculated;
62 struct ext4_sb_info *sbi = EXT4_SB(sb);
63 int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
64
65 if (!ext4_has_metadata_csum(sb))
66 return 1;
67
68 provided = le16_to_cpu(gdp->bg_block_bitmap_csum_lo);
69 calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
70 if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END) {
71 hi = le16_to_cpu(gdp->bg_block_bitmap_csum_hi);
72 provided |= (hi << 16);
73 } else
74 calculated &= 0xFFFF;
75
76 if (provided == calculated)
77 return 1;
78
79 return 0;
80}
81
82void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
83 struct ext4_group_desc *gdp,
84 struct buffer_head *bh)
85{
86 int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
87 __u32 csum;
88 struct ext4_sb_info *sbi = EXT4_SB(sb);
89
90 if (!ext4_has_metadata_csum(sb))
91 return;
92
93 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
94 gdp->bg_block_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
95 if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END)
96 gdp->bg_block_bitmap_csum_hi = cpu_to_le16(csum >> 16);
97}
1/*
2 * linux/fs/ext4/bitmap.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 */
9
10#include <linux/buffer_head.h>
11#include <linux/jbd2.h>
12#include "ext4.h"
13
14unsigned int ext4_count_free(char *bitmap, unsigned int numchars)
15{
16 return numchars * BITS_PER_BYTE - memweight(bitmap, numchars);
17}
18
19int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
20 struct ext4_group_desc *gdp,
21 struct buffer_head *bh, int sz)
22{
23 __u32 hi;
24 __u32 provided, calculated;
25 struct ext4_sb_info *sbi = EXT4_SB(sb);
26
27 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
28 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
29 return 1;
30
31 provided = le16_to_cpu(gdp->bg_inode_bitmap_csum_lo);
32 calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
33 if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END) {
34 hi = le16_to_cpu(gdp->bg_inode_bitmap_csum_hi);
35 provided |= (hi << 16);
36 } else
37 calculated &= 0xFFFF;
38
39 return provided == calculated;
40}
41
42void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
43 struct ext4_group_desc *gdp,
44 struct buffer_head *bh, int sz)
45{
46 __u32 csum;
47 struct ext4_sb_info *sbi = EXT4_SB(sb);
48
49 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
50 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
51 return;
52
53 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
54 gdp->bg_inode_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
55 if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END)
56 gdp->bg_inode_bitmap_csum_hi = cpu_to_le16(csum >> 16);
57}
58
59int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
60 struct ext4_group_desc *gdp,
61 struct buffer_head *bh)
62{
63 __u32 hi;
64 __u32 provided, calculated;
65 struct ext4_sb_info *sbi = EXT4_SB(sb);
66 int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
67
68 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
69 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
70 return 1;
71
72 provided = le16_to_cpu(gdp->bg_block_bitmap_csum_lo);
73 calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
74 if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END) {
75 hi = le16_to_cpu(gdp->bg_block_bitmap_csum_hi);
76 provided |= (hi << 16);
77 } else
78 calculated &= 0xFFFF;
79
80 if (provided == calculated)
81 return 1;
82
83 return 0;
84}
85
86void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
87 struct ext4_group_desc *gdp,
88 struct buffer_head *bh)
89{
90 int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
91 __u32 csum;
92 struct ext4_sb_info *sbi = EXT4_SB(sb);
93
94 if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
95 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
96 return;
97
98 csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
99 gdp->bg_block_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
100 if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END)
101 gdp->bg_block_bitmap_csum_hi = cpu_to_le16(csum >> 16);
102}