linux-ext4 - Re: On-disk field assignments for metadata checksum and snapshots

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Message-ID: <CAOQ4uxgXzNrrsAiii9iUetiiz-RdK+SixoRiPfGEp7zTPsLCGQ@mail.gmail.com>
Date:	Fri, 16 Sep 2011 09:52:43 +0300
From:	Amir Goldstein <amir73il@...il.com>
To:	"Ted Ts'o" <tytso@....edu>
Cc:	"Darrick J. Wong" <djwong@...ibm.com>, linux-ext4@...r.kernel.org,
	Andreas Dilger <adilger.kernel@...ger.ca>
Subject: Re: On-disk field assignments for metadata checksum and snapshots

On Thu, Sep 15, 2011 at 8:57 PM, Ted Ts'o <tytso@....edu> wrote:
> On Thu, Sep 15, 2011 at 07:01:47PM +0300, Amir Goldstein wrote:
>> > +       {       E2P_FEATURE_COMPAT, EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP,
>> > +                       "snapshot" },
>>
>> The feature name should read "exclude_bitmap".
>> This is a COMPAT feature which should be set by default on every mkfs.ext4.
>> The "has_snapshot" (or "snapshots") feature is a RO_COMPAT feature, which
>> can be turned on and off, depending on whether you want to enable or
>> disable snapshots.
>
> Yeah, I was trying to use a name which would be a bit more descriptive
> than "exclude_bitmap", but I agree that will get very confusing with
> the "has_snapshot" feature name.
>
>                                                - Ted
>

maybe we can simply call it snapshot_bitmap, if it pleases everyone ;-)

Amir.
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