linux-ext4 - Re: [PATCH] mke2fs: do not initialize block bitmaps of groups having super block

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Message-Id: <D7569AD1-FA75-44A4-BA8E-D47E96E75696@mit.edu>
Date:	Wed, 9 Nov 2011 15:34:20 -0500
From:	Theodore Tso <tytso@....EDU>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	Theodore Tso <tytso@....edu>,
	Yongqiang Yang <xiaoqiangnk@...il.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH] mke2fs: do not initialize block bitmaps of groups having super block


On Nov 9, 2011, at 11:23 AM, Andreas Dilger wrote:

> On 2011-11-09, at 3:53 AM, Yongqiang Yang <xiaoqiangnk@...il.com> wrote:
> 
>> Now mke2fs initializes block bitmaps of groups having super block, on
>> the other hand ext4_init_block_bitmap in kernel can handle this case
>> rightly.  So let mke2fs let block bitmaps of groups having super block
>> be uninitialized.
> 
> Is that true of older kernels, or only newer ones?  What about filesystems with META_BG set?

More to the point, what about file systems that don't have uninit_bg set?

What's the reason for wanting to make this change?

-- Ted


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