linux-kernel - Re: [ 110/180] ext4: dont let i_reserved_meta

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Date:	Sun, 7 Oct 2012 08:21:43 +0200
From:	Willy Tarreau <w@....eu>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	Brian Foster <bfoster@...hat.com>, Theodore Tso <tytso@....edu>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [ 110/180] ext4: dont let i_reserved_meta_blocks go negative

On Sun, Oct 07, 2012 at 02:47:22AM +0100, Ben Hutchings wrote:
(...)
> > > This seems to be working around a bug elsewhere.  Has the underlying
> > > bug been fixed in mainline yet?
> > > 
> > 
> > Yes, the bug was fixed in:
> > 
> > 03179fe92318e7934c180d96f12eff2cb36ef7b6
> > ext4: undo ext4_calc_metadata_amount if we fail to claim space
> 
> OK, and that's been applied to stable as:
> 
> 3.2: d9af293 ext4: undo ext4_calc_metadata_amount if we fail to claim space
> 3.4: c0ce1fd ext4: undo ext4_calc_metadata_amount if we fail to claim space
> 3.5: 564dfa3 ext4: undo ext4_calc_metadata_amount if we fail to claim space
> 
> Presumably it will need some backporting for older versions.

OK. I have checked the code, and it changed significantly since. I can
still see the logic there, but function names and calculations differ,
so I'd rather defer this patch for next version.

Willy

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