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Date:   Wed, 3 Jul 2019 18:09:07 +0200
From:   David Sterba <dsterba@suse.cz>
To:     Anand Jain <anand.jain@oracle.com>
Cc:     linux-btrfs@vger.kernel.org
Subject: Re: [PATCH v7 RESEND Rebased] btrfs-progs: dump-tree: add noscan
 option
Message-ID: <20190703160907.GW20977@twin.jikos.cz>
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On Wed, Jun 26, 2019 at 01:30:17AM -0700, Anand Jain wrote:
> From: Anand Jain <Anand.Jain@oracle.com>
> 
> The cli 'btrfs inspect dump-tree <dev>' will scan for the partner devices
> if any by default.
> 
> So as of now you can not inspect each mirrored device independently.
> 
> This patch adds noscan option, which when used won't scan the system for
> the partner devices, instead it just uses the devices provided in the
> argument.
> 
> For example:
>   btrfs inspect dump-tree --noscan <dev> [<dev>..]
> 
> This helps to debug degraded raid1 and raid10.
> 
> Signed-off-by: Anand Jain <anand.jain@oracle.com>

This makes misc-test/021-image-multi-devices fail

====== RUN CHECK root_helper mount /dev/loop2 .../btrfs-progs/tests//mnt
====== RUN CHECK md5sum .../btrfs-progs/tests//mnt/foobar
md5sum: .../btrfs-progs/tests//mnt/foobar: Input/output error
failed: md5sum .../btrfs-progs/tests//mnt/foobar
====== RUN CHECK root_helper umount .../btrfs-progs/tests//mnt
====== RUN CHECK root_helper losetup -d /dev/loop2
====== RUN CHECK root_helper losetup -d /dev/loop3

note the md5sum error, that does not happen otherwise