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From: "Pali Rohár" <pali.rohar@gmail.com>
To: Kevin Weidemann <kwe-lnx@postn.eu>
Cc: Jan Kara <jack@suse.cz>,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: udf: Prevent write-unsupported filesystem to be remounted read-write
Date: Mon, 14 Jan 2019 16:12:42 +0100	[thread overview]
Message-ID: <20190114151242.vrspcgld3n645qez@pali> (raw)
In-Reply-To: <20190114103011.GD13316@quack2.suse.cz>

On Monday 14 January 2019 11:30:11 Jan Kara wrote:
> On Mon 14-01-19 01:33:30, Kevin Weidemann wrote:
> > I have an issue with UDF. I used to be able to create a UDF fs in a way
> > that is very similar to this:
> > 
> > `# mkudffs --label=.... -m dvd -b 512 /dev/mapper/cryptdev1`

Hi Kevin! You should use -m dvd only in case your crtypdev1 device is
DVD. -m dvd prepares UDF filesystem layout and alignments for DVD media.

So you should not use -m dvd for hard disks.

Also DVDs have block size of 2048 bytes and UDF mandates that medium
block size matches UDF block size. Linux versions >= 4.11 do not have
problems with it, but other operating systems enforce that rule.

So you should not use -b 512 for DVD medias.

-- 
Pali Rohár
pali.rohar@gmail.com

  parent reply	other threads:[~2019-01-14 15:12 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <124cc6ea-ca79-20f2-651e-c2f909729ac0@gmx.de>
2019-01-14  0:33 ` Kevin Weidemann
2019-01-14 10:30   ` Jan Kara
2019-01-14 12:00     ` Pali Rohár
2019-01-14 12:30       ` Jan Kara
2019-01-15  3:07         ` Michael Sabolish
2019-01-15  8:31           ` Pali Rohár
2019-01-15  8:41             ` Jan Kara
2019-01-15  8:48               ` Pali Rohár
2019-01-15  9:45                 ` Jan Kara
2019-01-15 10:50                   ` Pali Rohár
2019-01-15 11:15                     ` Jan Kara
2019-01-14 15:12     ` Pali Rohár [this message]
2019-01-14 16:26       ` Kevin Weidemann
2019-01-22 13:22     ` Jan Kara
2019-01-23 20:29       ` Kevin Weidemann

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