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Date:   Wed, 9 Oct 2019 12:53:52 -0400
From:   "Theodore Y. Ts'o" <tytso@mit.edu>
To:     Iurii Zaikin <yzaikin@google.com>
Cc:     "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>, linux-ext4@vger.kernel.org,
        skhan@linuxfoundation.org, adilger.kernel@dilger.ca,
        kunit-dev@googlegroups.com,
        Brendan Higgins <brendanhiggins@google.com>
Subject: Re: [PATCH v1] fs/ext4/inode-test: KUnit test for ext4 inode.
Message-ID: <20191009165352.GA13279@mit.edu>
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On Tue, Oct 08, 2019 at 07:42:05PM -0700, Iurii Zaikin wrote:
> Note: this patch is intended to be applied against kselftest/test branch:
> https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/log/?h=test
> 
> KUnit tests for decoding extended 64 bit timestamps.

I'd suggest using "ext4: add kunit test for decoding extended
timestamps" as the one-line summary, and we probably don't need
anything else.

> Signed-off-by: Iurii Zaikin <yzaikin@google.com>
> ---
>  fs/ext4/Kconfig      |  12 +++
>  fs/ext4/Makefile     |   1 +
>  fs/ext4/inode-test.c | 217 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 230 insertions(+)
>  create mode 100644 fs/ext4/inode-test.c
> 
> diff --git a/fs/ext4/Kconfig b/fs/ext4/Kconfig
> index cbb5ca830e57..72c26abbce4c 100644
> --- a/fs/ext4/Kconfig
> +++ b/fs/ext4/Kconfig
> @@ -106,3 +106,15 @@ config EXT4_DEBUG
>    If you select Y here, then you will be able to turn on debugging
>    with a command such as:
>   echo 1 > /sys/module/ext4/parameters/mballoc_debug
> +
> +config EXT4_INODE_KUNIT_TEST
> + bool "KUnit test for ext4 inode"
> + depends on EXT4_FS
> + depends on KUNIT
> + help
> +  This builds the ext4 inode sysctl unit test, which runs on boot.
> +  Tests the encoding correctness of ext4 inode.
> +  For more information on KUnit and unit tests in general please refer
> +  to the KUnit documentation in Documentation/dev-tools/kunit/.

Should we perhaps just call the cofnig "EXT4_KUNIT_TESTS"?  Right now
the only thing we test is timestamp encoding/decoding, but later on
we'll be adding other other ext4 uninit tests --- and more ext4
encoding tests is not neceesarily where I would start, since the rest
are actually quite straightforward.

(The next set of uninit tests I'm interested in is the ext4's
extent_status tree, since that requires minimal amounts of test
mocks.)

So we might as well make the config name more general to begin with.

      	       	    	     	    - Ted