linux-ext4 - Re: Next3 on-disk format change request

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Message-ID: <AANLkTil17qZWKJfFsV77yADzxOffB2w94GN0COQyR82n@mail.gmail.com>
Date:	Thu, 24 Jun 2010 08:33:47 +0300
From:	Amir Goldstein <amir73il@...il.com>
To:	tytso@....edu
Cc:	Andreas Dilger <adilger@...ger.ca>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: Next3 on-disk format change request

On Thu, Jun 24, 2010 at 3:35 AM,  <tytso@....edu> wrote:
> On Tue, Jun 22, 2010 at 01:30:54PM +0300, Amir Goldstein wrote:
>> My on-disk format change request is to re-assign a ro_compat feature
>> for IS_SNAPSHOT (currently in s_flags).
>
> OK, so in addition to:
>
> #define EXT4_FEATURE_RO_COMPAT_HAS_SNAPSHOT     0x0080
>
> You would also like:
>
> #define EXT4_FEATURE_RO_COMPAT_IS_SNAPSHOT      0x0100
>
> which is a feature flag that the kernel will never support, since this
> is a hint that snapshot should only be mounted read-only, correct?
>

That is correct.
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