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

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Message-ID: <20180627123205.lckj7w3tcevqetcz@localhost.localdomain>
Date:   Wed, 27 Jun 2018 14:32:05 +0200
From:   Lukas Czerner <lczerner@...hat.com>
To:     "Theodore Y. Ts'o" <tytso@....edu>
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 06:41:07PM +0200, Lukas Czerner wrote:
> On Tue, Jun 26, 2018 at 11:52:00AM -0400, Theodore Y. Ts'o wrote:
> > 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.)?
> 
> Right, I have selinux enabled and there are selinux labels created.
> 
> > 
> > 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.
> 
> Agreed.

Hi Ted,

just letting you know that indeed, when disabling set_inode_xattr() in
__populate_fs() the test runs ok. If you don't already have one I'll
work on a patch to add this option.

-Lukas

> 
> Thanks!
> -Lukas
> > 
> > 							- Ted