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References: <20210317140439.9499-1-jglauber@digitalocean.com>
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From:   Song Liu <song@kernel.org>
Date:   Mon, 22 Mar 2021 10:39:29 -0700
Message-ID: <CAPhsuW6S7NOu-U+m9Cxt4gf3NLFZocHqB3eV_rgnoeVnxeCTfQ@mail.gmail.com>
Subject: Re: [PATCH] md: Fix missing unused status line of /proc/mdstat
To:     Jan Glauber <jglauber@digitalocean.com>
Cc:     linux-raid <linux-raid@vger.kernel.org>,
        open list <linux-kernel@vger.kernel.org>
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On Wed, Mar 17, 2021 at 7:05 AM Jan Glauber <jglauber@digitalocean.com> wrote:
>
> Reading /proc/mdstat with a read buffer size that would not
> fit the unused status line in the first read will skip this
> line from the output.
>
> So 'dd if=/proc/mdstat bs=64 2>/dev/null' will not print something
> like: unused devices: <none>
>
> Don't return NULL immediately in start() for v=2 but call
> show() once to print the status line also for multiple reads.
>
> Fixes: 1f4aace60b0e ("fs/seq_file.c: simplify seq_file iteration code and interface")
> Signed-off-by: Jan Glauber <jglauber@digitalocean.com>

Applied to md-next. Thanks!
Song