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Date:   Thu, 8 Oct 2020 15:28:05 -0700
From:   Josh Triplett <>
To:     Andreas Dilger <>
Cc:     "Theodore Y. Ts'o" <>,
        "Darrick J. Wong" <>,
        Jan Kara <>,
        Linux Kernel Mailing List <>,
        Ext4 Developers List <>
Subject: Re: ext4 regression in v5.9-rc2 from e7bfb5c9bb3d on ro fs with
 overlapped bitmaps

On Thu, Oct 08, 2020 at 01:25:57PM -0600, Andreas Dilger wrote:
> On Oct 8, 2020, at 1:12 PM, Josh Triplett <> wrote:
> > On Wed, Oct 07, 2020 at 08:57:12PM -0600, Andreas Dilger wrote:
> >> I *do* think that inline_data is an under-appreciated feature that I
> >> would be happy to see some improvements with.  I don't think that small
> >> files are a niche use case, and if we can clean up the inline_data code
> >> to work with 128-byte inodes I'm not against that, even though I'm not
> >> going to use that combination of features myself.
> > 
> > I'd love to see that happen. At the time, it seemed like too large of a
> > change to block on, which is why I ended up deciding to switch to
> > 256-byte inodes.
> Does that mean you are using inline_data with 256-byte inodes?

I am, yes, and it mostly works great. I've hit zero issues with it in
the filesystems I'm generating.

> That would also be good to know, since there haven't been any
> well-known users of this feature so far (AFAIK).  Since you are using
> this in a read-only manner, you won't hit the one know issue when an
> inline_data inode is extended to use an external block that may
> temporarily leave the inode in an inconsistent state.

I've run into a few other issues with it in other tools, as well. mke2fs
with inline_data generates invalid files given xattrs:

And extlinux doesn't like inline_data at all:

I'll report any other issues I run into using inline_data. I agree that
it's deeply underappreciated.

- Josh

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