Commit 10b01ee9 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

ext4: fix overhead calculation to account for the reserved gdt blocks 



The kernel calculation was underestimating the overhead by not taking
into account the reserved gdt blocks.  With this change, the overhead
calculated by the kernel matches the overhead calculation in mke2fs.

Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
parent 7102ffe4

fs/ext4/super.c

+3 −1
Original line number Diff line number Diff line
@@ -4177,9 +4177,11 @@ static int count_overhead(struct super_block *sb, ext4_group_t grp, 
	ext4_fsblk_t		first_block, last_block, b;

	ext4_group_t		i, ngroups = ext4_get_groups_count(sb);

	int			s, j, count = 0;

	int			has_super = ext4_bg_has_super(sb, grp);



	if (!ext4_has_feature_bigalloc(sb))

		return (ext4_bg_has_super(sb, grp) + ext4_bg_num_gdb(sb, grp) +

		return (has_super + ext4_bg_num_gdb(sb, grp) +

			(has_super ? le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks) : 0) +

			sbi->s_itb_per_group + 2);



	first_block = le32_to_cpu(sbi->s_es->s_first_data_block) +