From: Eric Sandeen <sandeen@sandeen.net>
To: "Theodore Ts'o" <tytso@mit.edu>, "Dušan Čolić" <dusanc@gmail.com>
Cc: fstests <fstests@vger.kernel.org>
Subject: Re: xfstests enospc tests not filling up file systems with transparent compression
Date: Thu, 10 Sep 2015 19:14:01 -0500 [thread overview]
Message-ID: <55F21CC9.6050903@sandeen.net> (raw)
In-Reply-To: <20150910234558.GC31723@thunk.org>
On 9/10/15 6:45 PM, Theodore Ts'o wrote:
> On Thu, Sep 10, 2015 at 10:09:16PM +0200, Dušan Čolić wrote:
>>
>> There are various xfstests that try to fill up whole partition but
>> they give false positives on file systems with transparent compression
>> because they use compressible test files like input from /dev/zero.
>> Different tests use different ways to generate test file(s) so what
>> would be the preferred way to generate incompressible test files? Use
>> /dev/urandom instead /dev/zero?
>
> I would expect that most tests would use fallocate to allocate space
> for ENOSPC tests, since it's much faster than writing all zeros.
Several of those tests are generic ones, designed to work on filesystems
like ext3 which don't support fallocate...
-Eric
prev parent reply other threads:[~2015-09-11 0:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-10 20:09 xfstests enospc tests not filling up file systems with transparent compression Dušan Čolić
2015-09-10 23:45 ` Theodore Ts'o
2015-09-11 0:14 ` Eric Sandeen [this message]
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