linux-ext4 - Re: [PATCH v2] xfstests, generic: add project quota attribute tests

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Date:	Thu, 7 Jul 2016 22:46:54 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Dave Chinner <david@...morbit.com>
Cc:	Eric Sandeen <sandeen@...deen.net>,
	Wang Shilong <wangshilong1991@...il.com>,
	fstests@...r.kernel.org, linux-ext4@...r.kernel.org,
	sihara@....com, lixi@....com, Wang Shilong <wshilong@....com>
Subject: Re: [PATCH v2] xfstests, generic: add project quota attribute tests

On Fri, Jul 08, 2016 at 10:51:27AM +1000, Dave Chinner wrote:
> On Wed, Jul 06, 2016 at 09:47:28PM -0500, Eric Sandeen wrote:
> > On 7/6/16 6:35 PM, Dave Chinner wrote:
> > 
> > ...
> > 
> > >> +_require_scratch
> > >> +_require_chattr
> > >> +_require_test_lsattr
> > >> +_require_quota
> > > 
> > > needs  _require_prjquota, and that function needs to be modified to
> > > detect for both XFS and ext4 support.
> > 
> > I think that if there is desire to test both xfs and non-xfs userspace
> > with project quota, then we need to differentiate between "e2fsprogs
> > and linux-quota and the kernel all support it" and "xfsprogs and
> > the kernel both support it" don't we?
> 
> Well, it should be just "linux-quota and kernel". ext4 needs to
> have the same mount option behaviour for project quota as it does
> for all other types of quota, not be dependent on mkfs....

Project quota for ext4 is an optional thing, and if nothing else, we
need to have a separate feature flag for legacy file systems that were
created before we started supporting project quota.  So if you want to
support project quota you *will* need to have a version of e2fsck that
understands project quota, and a version of mke2fs that knows how to
request that project quota be enabled, etc., etc.

So while it might be *nice* if ext4 could support project quota
without being dependent on having a specific version of mke2fs and
e2fsck installed, it's just simply not possible....

> > IOWs if the test uses setquota/repquota, chattr, mkfs, and fsck to
> > work with project quota, then that's a different set of requirements
> > from a test using xfs_io, xfs_quota, etc.
> 
> _require_linux_prjquota
> _require_xfs_prjquota
> 
> But that said, both ext4 and xfs need to work for both
> configurations, and they should all be using the common xfstests
> quota infrastructure....

Agreed, but we want xfstests to be able to support systems where
linux-quota (aka quotatools) and/or e2fsprogs and/or the kernel
haven't been upgraded to support project quota, don't we?  If for no
other reason than to be kind to the poor souls who have to support
RHEL 6.  :-)

						- Ted
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