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

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Date:	Fri, 16 Sep 2011 14:48:28 +0300
From:	Amir Goldstein <amir73il@...il.com>
To:	Yongqiang Yang <xiaoqiangnk@...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 2:35 PM, Yongqiang Yang <xiaoqiangnk@...il.com> wrote:
> 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.:-)

clearer to who?
this name is printed by "tune2fs -l"
potential readers of this output, who did not read the documentation
first, are just as likely to know what
"exclude_bitmap" means as when they read "resize_inode" or "flex_bg",
but at least "snapshot_bitmap"
will give them a clue.

Amir.
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