linux-ext4 - Ext2 and ext4 preallocation / mballoc

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Message-ID: <dda2e1011002170746x6cad8cekee6dcb7079002e10@mail.gmail.com>
Date:	Wed, 17 Feb 2010 16:46:19 +0100
From:	Gaëtan Podevijn <gpodevij@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: Ext2 and ext4 preallocation / mballoc

Hello,

Reading this http://web.mit.edu/tytso/www/linux/ext2intro.html I
understand that ext2 preallocates 8 blocks when a writing data to a
file. Ext3 uses the windows reservations method, but is that ext3 also
preallocates 8 blocks when writing data ?

Moreover, this page
http://kernelnewbies.org/Ext4#head-b2148d2a96d22a1bd7e376e6c08e4a38d08fb157
explains that ext3 allocates one block at a time and ext4 uses
multiblock allocation that is, allocates many block in a single system
call.

What is the difference between preallocation on ext2 (and ext3 ?) and mballoc ?

TYA,

Gaëtan

PS : I'm sorry for my really bad english
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