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

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Message-ID: <CAGBYx2ZZzftLcbkTXJY6nYed4eSRhXNC6oPzm7rfLiSt0YGMxQ@mail.gmail.com>
Date:	Fri, 16 Sep 2011 19:35:49 +0800
From:	Yongqiang Yang <xiaoqiangnk@...il.com>
To:	Amir Goldstein <amir73il@...il.com>
Cc:	"Ted Ts'o" <tytso@....edu>, "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 Fri, Sep 16, 2011 at 2:52 PM, Amir Goldstein <amir73il@...il.com> wrote:
> 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 ;-)
active_snapshot_bitmap will be clearer.:-)
>
> Amir.
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-- 
Best Wishes
Yongqiang Yang
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