linux-ext4 - Re: test f_extent_htree fails on 1.44.3-rc1

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Date:   Tue, 26 Jun 2018 11:52:00 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Lukas Czerner <lczerner@...hat.com>
Cc:     linux-ext4@...r.kernel.org, adilger@...ger.ca
Subject: Re: test f_extent_htree fails on 1.44.3-rc1

On Tue, Jun 26, 2018 at 02:58:18PM +0200, Lukas Czerner wrote:
> 
> Presumably because there is not enough blocks to allocate to create
> recreate the directory structure.
> 
> This is the error I get from the given mke2fs
> 
> Copying files into the device: __populate_fs: Could not allocate block in ext2 filesystem while writing file "yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy.202"
> mke2fs: Could not allocate block in ext2 filesystem while populating file system
> 
> I am not really sure if the size of the file system plays any role in
> the test so can you take a look ?

Thanks for reporting the bug!

I suspect I know what's going on.  The size of the file system is
calculated to be just large enough for files created in
/tmp/f_extent_htree.tmp/subdir, which get copied into the file system
using mke2fs -d /tmp/f_extent_htree.tmp/subdir.

I'm guessing you have SELinux enabled, or something else which is
automatically creating extended attributes (e.g., IMA, etc.)?

Mke2fs -d will copy the xattrs into file system to be created, and
this is taking up more space than we had allowed for.

We probably need to have a way to disable the xattr copy operation so
we get the same results on all systems.  We probably also need a new
test which tests all of the new functionality in mke2fs -d, but that's
a different issue.

							- Ted