Re: [PATCH 01/31] tune2fs: Don't convert block # to cluster # when clearing uninit_bg

Theodore Ts'o
2013-10-07T13:03:33Z

On Thu, Oct 03, 2013 at 12:04:44PM -0700, Darrick J. Wong wrote:
> On Thu, Oct 03, 2013 at 06:53:38PM +0200, Lukáš Czerner wrote:
> > On Mon, 30 Sep 2013, Darrick J. Wong wrote:
> >
> > > Date: Mon, 30 Sep 2013 18:26:49 -0700
> > > From: Darrick J. Wong <darrick.wong@oracle.com>
> > > To: tytso@mit.edu, darrick.wong@oracle.com
> > > Cc: linux-ext4@vger.kernel.org
> > > Subject: [PATCH 01/31] tune2fs: Don't convert block # to cluster # when
> > > clearing uninit_bg
> > >
> > > When we're constructing the initial block bitmap as part of removing the
> > > gdt_csum (i.e. uninit_bg) feature, we mustn't convert the block numbers to
> > > cluster numbers because ext2fs_mark_block_bitmap2() does this for us.
> >
> > I wonder if it's possible to use the old-style bitmap interface (the
> > one which does not understand 64-bit bitmaps). If so, then you also
> > need to fix ext2fs_mark_generic_bmap() (and others) so that we
> > convert blocks to clusters if needed.
>
> It's possible to do this (bad thing) by not specifying EXT2_FLAG_64BITS when
> calling ext2fs_openfs(); see patch 26 for a quick fix.

Bigalloc requires the new-style bitmaps, so patch 26 is the right fix
for this.

- Ted
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