linux-ext4 - Re: [PATCH 1/3] e4defrag: output blocks per extent by -c option

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Date:	Wed, 30 Sep 2009 14:28:12 -0400
From:	Greg Freemyer <greg.freemyer@...il.com>
To:	Kazuya Mio <k-mio@...jp.nec.com>
Cc:	linux-ext4@...r.kernel.org, Theodore Tso <tytso@....edu>
Subject: Re: [PATCH 1/3] e4defrag: output blocks per extent by -c option

2009/9/30 Kazuya Mio <k-mio@...jp.nec.com>:
> e4defrag with -c option outputs "ratio" that means the levels of
> fragmentation. However, it's difficult for users to understand, so we will
> use blocks per extent instead of ratio.
>
> Before:
> # e4defrag -c /mnt/mp1/file
> <File>                                         now/best          ratio
> /mnt/mp1/file                                   14/1             0.01%
>
>  Total/best extents                             14/1
>  Fragmentation ratio                            0.01%
>  Fragmentation score                            0.10
>  [0-30 no problem: 31-55 a little bit fragmented: 55- needs defrag]
>  This file(/mnt/mp1/file) does not need defragmentation.
>  Done.
>
> After:
> # e4defrag -c /mnt/mp1/file
> <File>                                         now/best        blk/ext
> /mnt/mp1/file                                   14/1              7142
>
>  Total/best extents                             14/1
>  Average blocks per extent                      7142
>  Fragmentation score                            0
>  [0-30 no problem: 31-55 a little bit fragmented: 55- needs defrag]
>  This file(/mnt/mp1/file) does not need defragmentation.
>  Done.

RFC

If we are going go that far (which I like), how about adding the avg
extent size in bytes.  (ie. 7142 * blocksize I assume).

Also a note about the max blocks / extent might be good.

ie. Add a more or less hard coded line
Ext4 max blocks per extent     32,768  (128MiB)

Otherwise your typical user won't know what perfect is.

Greg
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