linux-ext4 - Re: What is fragment in ext3/4 ?

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Message-ID: <46B355D6.8000007@gmail.com>
Date:	Sat, 04 Aug 2007 00:20:38 +0800
From:	Coly Li <colyli@...il.com>
To:	Eric Sandeen <sandeen@...hat.com>
CC:	Andreas Dilger <adilger@...sterfs.com>, linux-ext4@...r.kernel.org
Subject: Re: What is fragment in ext3/4 ?

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Eric Sandeen wrote:
> Andreas Dilger wrote:
>> On Aug 02, 2007  17:55 +0800, Coly Li wrote:
>>> These days, when I read the source code of mke2fs, I found an option -f
>>> to set the fragment size.
>>>
>>> But I can not find any explaining for ext3/4 framgment from google,
>>> excepting someone saying ext2/3 does not support this feature.
>>>
>>> Can anyone tell me what is the function or purpose of fragment of ext
>>> file system ?
>> This is an obsolete concept from BSD that was never used by ext[234].
>> Consider a "fragment" in this context to be the same as a "tail" for
>> reiserfs.  A very small file, or the end of a file that is less than
>> a block.
> 
> There's a fair amount of code around this never-implemented concept;
> should it be removed?  :)

I agree with this idea. It seems we will never implement it in future,
once "fragment" packed into inode.

Coly

> 
> -Eric
> 
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