Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *  linux/fs/ext4/bitmap.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Copyright (C) 1992, 1993, 1994, 1995
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Remy Card (card@masi.ibp.fr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Laboratoire MASI - Institut Blaise Pascal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * Universite Pierre et Marie Curie (Paris VI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "ext4.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) unsigned int ext4_count_free(char *bitmap, unsigned int numchars)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	return numchars * BITS_PER_BYTE - memweight(bitmap, numchars);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 				  struct ext4_group_desc *gdp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 				  struct buffer_head *bh, int sz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	__u32 hi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	__u32 provided, calculated;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	struct ext4_sb_info *sbi = EXT4_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	if (!ext4_has_metadata_csum(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	provided = le16_to_cpu(gdp->bg_inode_bitmap_csum_lo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 		hi = le16_to_cpu(gdp->bg_inode_bitmap_csum_hi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 		provided |= (hi << 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		calculated &= 0xFFFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	return provided == calculated;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 				struct ext4_group_desc *gdp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 				struct buffer_head *bh, int sz)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	__u32 csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	struct ext4_sb_info *sbi = EXT4_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	if (!ext4_has_metadata_csum(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	gdp->bg_inode_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	if (sbi->s_desc_size >= EXT4_BG_INODE_BITMAP_CSUM_HI_END)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		gdp->bg_inode_bitmap_csum_hi = cpu_to_le16(csum >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 				  struct ext4_group_desc *gdp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 				  struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	__u32 hi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	__u32 provided, calculated;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 	struct ext4_sb_info *sbi = EXT4_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	if (!ext4_has_metadata_csum(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	provided = le16_to_cpu(gdp->bg_block_bitmap_csum_lo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	calculated = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 		hi = le16_to_cpu(gdp->bg_block_bitmap_csum_hi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 		provided |= (hi << 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 		calculated &= 0xFFFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) 	if (provided == calculated)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 		return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 				struct ext4_group_desc *gdp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 				struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 	int sz = EXT4_CLUSTERS_PER_GROUP(sb) / 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 	__u32 csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) 	struct ext4_sb_info *sbi = EXT4_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) 	if (!ext4_has_metadata_csum(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) 	csum = ext4_chksum(sbi, sbi->s_csum_seed, (__u8 *)bh->b_data, sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) 	gdp->bg_block_bitmap_csum_lo = cpu_to_le16(csum & 0xFFFF);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) 	if (sbi->s_desc_size >= EXT4_BG_BLOCK_BITMAP_CSUM_HI_END)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) 		gdp->bg_block_bitmap_csum_hi = cpu_to_le16(csum >> 16);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }