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Commit 4f658e77 authored by Theodore Ts'o's avatar Theodore Ts'o Committed by Greg Kroah-Hartman
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ext4: fix overhead calculation to account for the reserved gdt blocks 



commit 10b01ee92df52c8d7200afead4d5e5f55a5c58b1 upstream.

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
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ea5e8a8f

fs/ext4/super.c

+3 −1
Original line number Diff line number Diff line
@@ -3241,9 +3241,11 @@ 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) +