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

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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: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
This commit is contained in:
Theodore Ts'o 2022-04-14 21:31:27 -04:00
parent 7102ffe4c1
commit 10b01ee92d
1 changed files with 3 additions and 1 deletions
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4
fs/ext4/super.c
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@ -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) +