linux-ext4 - Re: [RESEND] [PATCH 2/2 v2] e2fsck: Do not forget to discard last block group

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Message-ID: <alpine.LFD.2.00.1202241550520.13074@dhcp-27-109.brq.redhat.com>
Date:	Fri, 24 Feb 2012 15:57:19 +0100 (CET)
From:	Lukas Czerner <lczerner@...hat.com>
To:	Phillip Susi <psusi@...ntu.com>
cc:	Lukas Czerner <lczerner@...hat.com>, linux-ext4@...r.kernel.org,
	tytso@....edu, sandeen@...hat.com
Subject: Re: [RESEND] [PATCH 2/2 v2] e2fsck: Do not forget to discard last
 block group

On Fri, 24 Feb 2012, Phillip Susi wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> On 2/24/2012 3:34 AM, Lukas Czerner wrote:
> > Previously when running e2fsck with '-E discard' argument the end
> > of the last group has not been discarded. This patch fixes it so
> > we always discard the end of the last group if needed.
> > 
> > This commit also removes unneeded argument from the 
> > e2fsck_discard_blocks(). Simultaneously the commit causes the
> > block groups with BLOCK_UNINIT flag not to be discarded, which
> > makes since because we do not need to reclaim the space since so
> > far there has not been written anything.
> 
> I don't see where this patch changes anything to do with uninitialized
> block bitmaps.  It also is still a good idea to discard them since
> they may have been initialized at some point in the past and become
> uninitialized again.

I do not see how the group would become UNINIT again, so there is not
reason to discard it. Previously we could count free block through out
several groups (accounting or BLOCK_UNINIT groups as well. We do not do
that now, because we discard every group separately.

Thanks!
-Lukas

> 
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