Date:	Fri, 5 Sep 2008 20:37:27 +0530
From:	"Manish Katiyar" <mkatiyar@...il.com>
To:	"Theodore Tso" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH] resend : badblocks - Print progress in percent complete and time elapsed in verbose mode.

On Fri, Sep 5, 2008 at 6:36 PM, Theodore Tso <tytso@....edu> wrote:
> On Thu, Sep 04, 2008 at 02:44:38PM +0530, Manish Katiyar wrote:
>> Make badblocks -v print percent complete and time elapsed. Addresses
>> debian bug# 429739.
>
> There were a couple of problems with this bug.  First of all, although
> I understand your not wanting to change what -v does, having two
> verbose options is rather confusing.  Also, since progress information
> is printed using backspaces and so on, it's not really practical for a
> program to depend on the output of badblocks -v.

Thanks a lot Ted,

Yes, I thought that it might break backwards compatibility if there
are any automated scripts relying on this so added a new one. I am
still in newbie learning phase and your feedbacks/criticisms will help
me a lot.

Thanks -
Manish



>
> Secondly, the way you formatted the elapsed time was very fragile and
> would break if someone ever tried to change the way the elapsed time
> was printed (or if the number of hours went ever became greater than
> 999, which I grant is unlikely).  I noticed the problem because I
> wasn't fond of the the "34h 45m 20s" format (it doesn't
> internationalize well, for one thing), and tried to change it to a
> mm:ss or hh:mm:ss format, at which point mayhem broke loose.

Thanks a lot Ted,




>
> So I've simplified the patch significantly, as follows.
>
>                                                - Ted
>
> commit 504f7a2981306032fff7084c0d90beaa45872ee0
> Author: Manish Katiyar <mkatiyar@...il.com>
> Date:   Thu Sep 4 14:44:38 2008 +0530
>
>    badblocks: Display time and percentage complete in verbose mode.
>
>    Addresses-Debian-Bug: #429739.
>
>    Signed-off-by: "Manish Katiyar" <mkatiyar@...il.com>
>    Signed-off-by: "Theodore Ts'o" <tytso@....edu>
>
> diff --git a/misc/badblocks.c b/misc/badblocks.c
> index 1d0f95a..e7e9968 100644
> --- a/misc/badblocks.c
> +++ b/misc/badblocks.c
> @@ -55,7 +55,6 @@ extern int optind;
>  #include <sys/time.h>
>  #include <sys/ioctl.h>
>  #include <sys/types.h>
> -#include <sys/time.h>
>
>  #include "et/com_err.h"
>  #include "ext2fs/ext2_io.h"
> @@ -78,6 +77,7 @@ static int current_O_DIRECT = 0;      /* Current status of O_DIRECT flag */
>  static int exclusive_ok = 0;
>  static unsigned int max_bb = 0;                /* Abort test if more than this number of bad blocks has been encountered */
>  static unsigned int d_flag = 0;                /* delay factor between reads */
> +static struct timeval time_start;
>
>  #define T_INC 32
>
> @@ -161,11 +161,52 @@ static int bb_output (blk_t bad)
>        return 1;
>  }
>
> +static char *time_diff_format(struct timeval *tv1,
> +                             struct timeval *tv2, char *buf)
> +{
> +        time_t diff = (tv1->tv_sec - tv2->tv_sec);
> +       int     hr,min,sec;
> +
> +       sec = diff % 60;
> +       diff /= 60;
> +       min = diff % 60;
> +       hr = diff / 60;
> +
> +       if (hr)
> +               sprintf(buf, "%d:%02d:%02d", hr, min, sec);
> +       else
> +               sprintf(buf, "%d:%02d", min, sec);
> +       return buf;
> +}
> +
> +static float calc_percent(unsigned long current, unsigned long total) {
> +       float percent = 0.0;
> +       if (total <= 0)
> +               return percent;
> +       if (current >= total) {
> +               percent = 100.0;
> +       } else {
> +               percent=(100.0*(float)current/(float)total);
> +       }
> +       return percent;
> +}
> +
>  static void print_status(void)
>  {
> -       fprintf(stderr, "%15lu/%15lu", (unsigned long) currently_testing,
> -               (unsigned long) num_blocks);
> -       fputs("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b", stderr);
> +       struct timeval time_end;
> +       char diff_buf[32], line_buf[128];
> +       int len;
> +
> +       gettimeofday(&time_end, 0);
> +       len = snprintf(line_buf, sizeof(line_buf),
> +                      _("%6.2f%% done, %s elapsed"),
> +                      calc_percent((unsigned long) currently_testing,
> +                                   (unsigned long) num_blocks),
> +                      time_diff_format(&time_end, &time_start, diff_buf));
> +       fputs(line_buf, stderr);
> +       memset(line_buf, '\b', len);
> +       line_buf[len] = 0;
> +       fputs(line_buf, stderr);
>        fflush (stderr);
>  }
>
> @@ -989,6 +1030,7 @@ int main (int argc, char ** argv)
>                        break;
>                case 'v':
>                        v_flag++;
> +                       gettimeofday(&time_start, 0);
>                        break;
>                case 'w':
>                        if (w_flag)
>
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