linux-ext4 - Re: Removing the shared class of tests

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Date:   Wed, 26 Jun 2019 10:37:13 +0800
From:   Eryu Guan <guaneryu@...il.com>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Christoph Hellwig <hch@...radead.org>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Gabriel Krisman Bertazi <krisman@...labora.com>,
        fstests@...r.kernel.org, linux-ext4@...r.kernel.org,
        "Lakshmipathi.G" <lakshmipathi.ganapathi@...labora.co.uk>
Subject: Re: Removing the shared class of tests

On Mon, Jun 24, 2019 at 09:07:30AM -0400, Theodore Ts'o wrote:
> On Mon, Jun 24, 2019 at 12:16:10AM -0700, Christoph Hellwig wrote:
> > 
> > As for the higher level question?  The shared tests always confused the
> > heck out of me.  generic with the right feature checks seem like a much
> > better idea.
> 
> Agreed.  I've sent out a patch series to bring the number of patches
> in shared down to four.  Here's what's left:
> 
> shared/002 --- needs a feature test to somehow determine whether a
> 	file system supports thousads of xattrs in a file (currently
> 	on btrfs and xfs)

Another option would be just whitelist btrfs and xfs in a require rule,
we already have few require rules work like that, e.g.
_fstyp_has_non_default_seek_data_hole(), this is not ideal, but works in
such corner cases.

Thanks,
Eryu

> 
> shared/011 --- needs some way of determining that a file system
> 	supports cgroup-aware writeback (currently enabled only for
> 	ext4 and btrfs).  Do we consider lack of support of
> 	cgroup-aware writeback a bug?  If so, maybe it doesn't need a
> 	feature test at all?
> 
> shared/032 --- needs a feature test to determine whether or not a file
> 	system's mkfs supports detection of "foreign file systems".
> 	e.g., whether or not it warns if you try overwrite a file
> 	system w/o another file system.  (Currently enabled by xfs and
> 	btrfs; it doesn't work for ext[234] because e2fsprogs, because
> 	I didn't want to break existing shell scripts, only warns when
> 	it is used interactively.  We could a way to force it to be
> 	activated it points out this tests is fundamentally testing
> 	implementation choices of the userspace utilities of a file
> 	system.  Does it belong in xfstests?   : ¯\_(ツ)_/¯ )
> 
> shared/289 --- contains ext4, xfs, and btrfs mechanisms for
> 	determining blocks which are unallocated.  Has hard-coded
> 	invocations to dumpe2fs, xfs_db, and /bin/btrfs.
> 
> These don't have obvious solutions.  We could maybe add a _notrun if
> adding the thousands of xattrs fails with an ENOSPC or related error
> (f2fs uses something else).
> 
> Maybe we just move shared/011 and move it generic/ w/o a feature test.
> 
> Maybe we remove shared/032 altogether, since for e2fsprogs IMHO
> the right place to put it is the regression test in e2fsprogs --- but
> I know xfs has a different test philosophy for xfsprogs; and tha begs
> the question of what to do for mkfs.btrfs.
> 
> And maybe we just split up shared/289 to three different tests in
> ext4/, xfs/, and btrfs/, since it would make the test script much
> simpler to understand?
> 
> What do people think?
> 
> 						- Ted