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

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Message-ID: <20070803000228.GO6142@schatzie.adilger.int>
Date:	Thu, 2 Aug 2007 18:02:28 -0600
From:	Andreas Dilger <adilger@...sterfs.com>
To:	Coly Li <colyli@...il.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: What is fragment in ext3/4 ?

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.

Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.

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