linux-ext4 - Re: [PATCH 1/1] e2fsck: Add percent to files and blocks feature

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Date:   Wed, 26 Jul 2023 10:15:26 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Oscar Megia López <megia.oscar@...il.com>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/1] e2fsck: Add percent to files and blocks feature

On Apr 23, 2023, at 02:25, Oscar Megia López <megia.oscar@...il.com> wrote:
> 
> I need percentages to see how disk is occupied.
> Used and maximum are good, but humans work better with percentages.
> 
> When my linux boots,
> I haven't enough time to remember numbers and calculate.
> 
> My PC is very fast. I can only see the message for one or two seconds.
> 
> If also I would see percentages for me would be perfect.
> 
> I think that this feature is going to be good for everyone.
> 
> Signed-off-by: Oscar Megia López <megia.oscar@...il.com>
> ---
> e2fsck/unix.c | 25 +++++++++++++++++++++++--
> 1 file changed, 23 insertions(+), 2 deletions(-)
> 
> diff --git a/e2fsck/unix.c b/e2fsck/unix.c
> index e5b672a2..b820ca8d 100644
> --- a/e2fsck/unix.c
> +++ b/e2fsck/unix.c
> @@ -350,6 +350,8 @@ static void check_if_skip(e2fsck_t ctx)
>    int defer_check_on_battery;
>    int broken_system_clock;
>    time_t lastcheck;
> +    char percent_files[9];
> +    char percent_blocks[9];
> 
>    if (ctx->flags & E2F_FLAG_PROBLEMS_FIXED)
>        return;
> @@ -442,14 +444,33 @@ static void check_if_skip(e2fsck_t ctx)
>        ext2fs_mark_super_dirty(fs);
>    }
> 
> +    /* Calculate percentages */
> +    if (fs->super->s_inodes_count > 0) {
> +        snprintf(percent_files, sizeof(percent_files), " (%u%%) ",
> +        ((fs->super->s_inodes_count - fs->super->s_free_inodes_count) * 100) /
> +        fs->super->s_inodes_count);
> +    } else {
> +        snprintf(percent_files, sizeof(percent_files), " ");
> +    }

Instead of snprintf() this could just be initialized at variable declaration time:

        char percent_files[8] = "";

That avoids extra runtime overhead and is no less safe. (This is adjusted to compensate
for the format change below.)

> +    if (ext2fs_blocks_count(fs->super) > 0) {
> +        snprintf(percent_blocks, sizeof(percent_blocks), " (%llu%%) ",
> +        (unsigned long long) ((ext2fs_blocks_count(fs->super) -
> +        ext2fs_free_blocks_count(fs->super)) * 100) / ext2fs_blocks_count(fs->super));
> +    } else {
> +        snprintf(percent_blocks, sizeof(percent_blocks), " ");
> +    }

This could similarly be set at initialization:

        char percent_blocks[8] = "";

>    /* Print the summary message when we're skipping a full check */
> -    log_out(ctx, _("%s: clean, %u/%u files, %llu/%llu blocks"),
> +    log_out(ctx, _("%s: clean, %u/%u%sfiles, %llu/%llu%sblocks"),

This would be more readable if it left one space after each "%s" and then didn't
include the trailing space in each string:

    log_out(ctx, _("%s: clean, %u/%u%s files, %llu/%llu%s blocks"),

Cheers, Andreas

>        ctx->device_name,
>        fs->super->s_inodes_count - fs->super->s_free_inodes_count,
>        fs->super->s_inodes_count,
> +        percent_files,
>        (unsigned long long) ext2fs_blocks_count(fs->super) -
>        ext2fs_free_blocks_count(fs->super),
> -        (unsigned long long) ext2fs_blocks_count(fs->super));
> +        (unsigned long long) ext2fs_blocks_count(fs->super),
> +        percent_blocks);
>    next_check = 100000;
>    if (fs->super->s_max_mnt_count > 0) {
>        next_check = fs->super->s_max_mnt_count - fs->super->s_mnt_count;
> -- 
> 2.40.0
>