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Revert "ext4: remove unnecessary check in ext4_bg_num_gdb_nometa" 

This reverts commit ad3f09be6c.

The reverted commit was intended to simpfy the code to get group
descriptor block number in non-meta block group by assuming
s_gdb_count is block number used for all non-meta block group descriptors.
However s_gdb_count is block number used for all meta *and* non-meta
group descriptors. So s_gdb_group will be > actual group descriptor block
number used for all non-meta block group which should be "total non-meta
block group" / "group descriptors per block", e.g. s_first_meta_bg.

Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com>
Link: https://lore.kernel.org/r/20230613225025.3859522-1-shikemeng@huaweicloud.com
Fixes: ad3f09be6c ("ext4: remove unnecessary check in ext4_bg_num_gdb_nometa")
Cc: stable@kernel.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Kemeng Shi 2023-06-14 06:50:25 +08:00 committed by Theodore Ts'o
parent dea9d8f764
commit 1948279211
1 changed files with 4 additions and 1 deletions
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fs/ext4/balloc.c
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@ -886,6 +886,9 @@ static unsigned long ext4_bg_num_gdb_nometa(struct super_block *sb,
if (!ext4_bg_has_super(sb, group))
return 0;
if (ext4_has_feature_meta_bg(sb))
return le32_to_cpu(EXT4_SB(sb)->s_es->s_first_meta_bg);
else
return EXT4_SB(sb)->s_gdb_count;
}