linux-kernel - Re: [PATCH xfstests v3] overlay: Enable character device to be the base fs partition

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Date:   Wed, 25 Sep 2019 17:29:13 +0800
From:   Eryu Guan <guaneryu@...il.com>
To:     Amir Goldstein <amir73il@...il.com>
Cc:     Zhihao Cheng <chengzhihao1@...wei.com>,
        David Oberhollenzer <david.oberhollenzer@...ma-star.at>,
        Eric Biggers <ebiggers@...gle.com>,
        "zhangyi (F)" <yi.zhang@...wei.com>,
        fstests <fstests@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH xfstests v3] overlay: Enable character device to be the
 base fs partition

On Wed, Sep 25, 2019 at 10:18:39AM +0300, Amir Goldstein wrote:
> On Wed, Sep 25, 2019 at 9:29 AM Zhihao Cheng <chengzhihao1@...wei.com> wrote:
> >
> > When running overlay tests using character devices as base fs partitions,
> > all overlay usecase results become 'notrun'. Function
> > '_overay_config_override' (common/config) detects that the current base
> > fs partition is not a block device and will set FSTYP to base fs. The
> > overlay usecase will check the current FSTYP, and if it is not 'overlay'
> > or 'generic', it will skip the execution.
> >
> > For example, using UBIFS as base fs skips all overlay usecases:
> >
> >   FSTYP         -- ubifs       # FSTYP should be overridden as 'overlay'
> >   MKFS_OPTIONS  -- /dev/ubi0_1 # Character device
> >   MOUNT_OPTIONS -- -t ubifs /dev/ubi0_1 /tmp/scratch
> >
> >   overlay/001   [not run] not suitable for this filesystem type: ubifs
> >   overlay/002   [not run] not suitable for this filesystem type: ubifs
> >   overlay/003   [not run] not suitable for this filesystem type: ubifs
> >
> > When checking that the base fs partition is a block/character device,
> > FSTYP is overwritten as 'overlay'. This patch allows the base fs
> > partition to be a character device that can also execute overlay
> > usecases (such as ubifs).
> >
> > Signed-off-by: Zhihao Cheng <chengzhihao1@...wei.com>
> > Signed-off-by: Amir Goldstein <amir73il@...il.com>
> 
> Looks fine.
> Eryu, you may change this to Reviewed-by

Sure, thanks for the review!

Eryu