linux-ext4 - Re: libext2fs: don't flush to device opened in read-only mode

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Message-ID: <20170524215622.fh7yin4fttggw36f@thunk.org>
Date:   Wed, 24 May 2017 17:56:22 -0400
From:   Theodore Ts'o <tytso@....edu>
To:     Konstantin Chistyakov <Konstantin.Chistyakov@...agon-software.com>
Cc:     "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: libext2fs: don't flush to device opened in read-only mode

On Mon, May 22, 2017 at 09:48:00AM +0000, Konstantin Chistyakov wrote:
> From: Konstantin Chistyakov <Konstantin.Chistyakov@...agon-software.com>
> Date: Tue, 19 May 2017 09:23:29 -0600
> Subject: [PATCH] libext2fs: don't flush to device opened in read-only mode
> 
> From: Konstantin Chistyakov <Konstantin.Chistyakov@...agon-software.com>
> 
> If the e2fsck is called with both -f -n options, the checking completing with a flushing error (retcode 8).
> 
> Catch error from the unix_flush() fsync(data->dev) when data->dev is opened in read-only mode:

I can't reproduce this problem.  What storage device or operating
system are you using?

That being said, this is probably the wrong place to fix it.  The
better fix is in e2fsck/unix.c, by adding a read-only test.

       	      	 		   	  - Ted