Re: [PATCH v2 v2 1/2] ext4: add blocks_allocated to mb_stats output

Andreas Dilger
2026-04-19T09:19:17Z

On Apr 19, 2026, at 00:34, Baolin Liu <liubaolin12138@163.com> wrote:
>
> From: Baolin Liu <liubaolin@kylinos.cn>
>
> Add blocks_allocated to /proc/fs/ext4/<dev>/mb_stats so that the
> reported statistics match the mballoc summary printed at unmount time.
>
> Signed-off-by: Baolin Liu <liubaolin@kylinos.cn>

Reviewed-by: Andreas Dilger <adilger@dilger.ca <mailto:adilger@dilger.ca>>

> ---
> fs/ext4/mballoc.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 20e9fdaf4301..1e13ef62cb9d 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -3211,6 +3211,8 @@ int ext4_seq_mb_stats_show(struct seq_file *seq,
> "\tTo enable, please write \"1\" to sysfs file mb_stats.\n");
> return 0;
> }
> + seq_printf(seq, "\tblocks_allocated: %u\n",
> + atomic_read(&sbi->s_bal_allocated));
> seq_printf(seq, "\treqs: %u\n", atomic_read(&sbi->s_bal_reqs));
> seq_printf(seq, "\tsuccess: %u\n", atomic_read(&sbi->s_bal_success));
>
> --
> 2.51.0
>

Cheers, Andreas