Contributors: 11
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Darrick J. Wong |
351 |
73.43% |
2 |
14.29% |
| Dave Kleikamp |
77 |
16.11% |
1 |
7.14% |
| Tao Ma |
12 |
2.51% |
1 |
7.14% |
| Mingming Cao |
10 |
2.09% |
1 |
7.14% |
| Akinobu Mita |
9 |
1.88% |
1 |
7.14% |
| Alex Tomas |
6 |
1.26% |
1 |
7.14% |
| Theodore Y. Ts'o |
6 |
1.26% |
3 |
21.43% |
| Dmitriy Monakhov |
4 |
0.84% |
1 |
7.14% |
| Chi Wu |
1 |
0.21% |
1 |
7.14% |
| Christoph Hellwig |
1 |
0.21% |
1 |
7.14% |
| Greg Kroah-Hartman |
1 |
0.21% |
1 |
7.14% |
| Total |
478 |
|
14 |
|
// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/ext4/bitmap.c
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*/
#include <linux/buffer_head.h>
#include "ext4.h"
unsigned int ext4_count_free(char *bitmap, unsigned int numchars)
{
return numchars * BITS_PER_BYTE - memweight(bitmap, numchars);
}
int ext4_inode_bitmap_csum_verify(struct super_block *sb,
struct ext4_group_desc *gdp,
struct buffer_head *bh, int sz)
{
__u32 hi;
__u32 provided, calculated;
struct ext4_sb_info *sbi = EXT4_SB(sb);
if (!ext4_has_metadata_csum(sb))
return 1;
provided = le16_to_cpu(gdp->bg_inode_bitmap_csum_lo);
calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END) {
hi = le16_to_cpu(gdp->bg_inode_bitmap_csum_hi);
provided |= (hi << 16);
} else
calculated &= 0xFFFF;
return provided == calculated;
}
void ext4_inode_bitmap_csum_set(struct super_block *sb,
struct ext4_group_desc *gdp,
struct buffer_head *bh, int sz)
{
__u32 csum;
struct ext4_sb_info *sbi = EXT4_SB(sb);
if (!ext4_has_metadata_csum(sb))
return;
csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
gdp->bg_inode_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END)
gdp->bg_inode_bitmap_csum_hi = cpu_to_le16(csum >> 16);
}
int ext4_block_bitmap_csum_verify(struct super_block *sb,
struct ext4_group_desc *gdp,
struct buffer_head *bh)
{
__u32 hi;
__u32 provided, calculated;
struct ext4_sb_info *sbi = EXT4_SB(sb);
int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
if (!ext4_has_metadata_csum(sb))
return 1;
provided = le16_to_cpu(gdp->bg_block_bitmap_csum_lo);
calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END) {
hi = le16_to_cpu(gdp->bg_block_bitmap_csum_hi);
provided |= (hi << 16);
} else
calculated &= 0xFFFF;
return provided == calculated;
}
void ext4_block_bitmap_csum_set(struct super_block *sb,
struct ext4_group_desc *gdp,
struct buffer_head *bh)
{
int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
__u32 csum;
struct ext4_sb_info *sbi = EXT4_SB(sb);
if (!ext4_has_metadata_csum(sb))
return;
csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
gdp->bg_block_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END)
gdp->bg_block_bitmap_csum_hi = cpu_to_le16(csum >> 16);
}