linux-ext4 - Re: e4defrag don't work really well

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Date:   Thu, 16 Feb 2023 19:21:50 +0100
From:   Reindl Harald <h.reindl@...lounge.net>
To:     Eric Sandeen <sandeen@...deen.net>, linux-ext4@...r.kernel.org
Subject: Re: e4defrag don't work really well



Am 16.02.23 um 17:50 schrieb Eric Sandeen:
> On 2/12/23 12:14 PM, Reindl Harald wrote:
>>
>> what's wrong with e4defrag that it pretends it reduced th efragments of a file to 1 while in the next "e4defrag -c" (why does that only list 5 files at all) the same file is listed again with the same old frag count?
> 
> You might want to examine the actual allocation before and after with "filefrag -v"
> which could offer some clues to whether anything was modified by e4defrag.
> 
> (I would also suggest that there is no need to defragment a 3-extent 2 megabyte
> file, in general.)

it's not a question if it's needed

the point is it pretends "Success: [1/1]" but a following "e4defrag -c" 
still says "now/best 3/1"

>> ----------------------------
>>
>> [root@...-rhsoft:~]$ e4defrag -c /mnt/data/audio/
>> e4defrag 1.46.5 (30-Dec-2021)
>> <Fragmented files>                             now/best       size/ext
>> 1. /mnt/data/audio/Smokie/Solid Ground/Smokie - Little Town Flirt.mp3
>>                                                   3/1           2389 KB
>> 2. /mnt/data/audio/Ace Frehley/Second Sighting/Ace Frehley - Fallen Angel.mp3
>>                                                   3/1           2389 KB
>> 3. /mnt/data/audio/Mr. Big/Defying Gravity/Mr. Big - Mean To Me.mp3
>>                                                   3/1           2389 KB
>> 4. /mnt/data/audio/Juice Newton/Quiet Lies/Juice Newton - Im Gonna Be Strong.mp3
>>                                                   3/1           2389 KB
>> 5. /mnt/data/audio/Vicious Rumors/Something Burning/Vicious Rumors - Ballhog.mp3
>>                                                   3/1           2389 KB
>>
>> ----------------------------
>>
>> [root@...-rhsoft:~]$ e4defrag "/mnt/data/audio/Smokie/Solid Ground/Smokie - Little Town Flirt.mp3"
>> e4defrag 1.46.5 (30-Dec-2021)
>> ext4 defragmentation for /mnt/data/audio/Smokie/Solid Ground/Smokie - Little Town Flirt.mp3
>> [1/1]/mnt/data/audio/Smokie/Solid Ground/Smokie - Little Town Flirt.mp3:        100%    [ OK ]
>>   Success:                       [1/1]
>>
>> ----------------------------
>>
>> [root@...-rhsoft:~]$ e4defrag -c /mnt/data/audio/
>> e4defrag 1.46.5 (30-Dec-2021)
>> <Fragmented files>                             now/best       size/ext
>> 1. /mnt/data/audio/Smokie/Solid Ground/Smokie - Little Town Flirt.mp3
>>                                                   3/1           2389 KB
>> 2. /mnt/data/audio/Ace Frehley/Second Sighting/Ace Frehley - Fallen Angel.mp3
>>                                                   3/1           2389 KB
>> 3. /mnt/data/audio/Mr. Big/Defying Gravity/Mr. Big - Mean To Me.mp3
>>                                                   3/1           2389 KB
>> 4. /mnt/data/audio/Juice Newton/Quiet Lies/Juice Newton - Im Gonna Be Strong.mp3
>>                                                   3/1           2389 KB
>> 5. /mnt/data/audio/Vicious Rumors/Something Burning/Vicious Rumors - Ballhog.mp3
>>                                                   3/1           2389 KB