Re: [PATCH v3 07/14] btrfs-progs: Doc/mkfs: Add extra condition for rootdir option

[Goffredo Baroncelli <kreijack@inwind.it>]

On 09/28/2017 02:00 AM, Qu Wenruo wrote:
> 
> 
> On 2017年09月28日 00:20, David Sterba wrote:
>> On Mon, Sep 25, 2017 at 07:15:30AM -0400, Austin S. Hemmelgarn wrote:
>>> On 2017-09-24 10:08, Goffredo Baroncelli wrote:
>>>> On 09/24/2017 12:10 PM, Anand Jain wrote:
>>
>> A lot of points in this thread, let me address them here.
>>
>> I don't want to remove --rootdir functionality, the fix that's being
>> proposed removes the minimalization -- feature that was not well known,
>> but I understand it's useful (and already used).
>>
>> I'd like to fix that in another way, eg. as an option to mkfs or a
>> separate tool.
>>
>> I'm not worried about adding more code or code complexity. If we do it
>> right it's not a problem in the long run. But people for some reason
>> like to delete other people's code or functionality.
>>
>> Regarding guessing number of users, this is always hard. So if there's
>> one vocal enough to let us know about the usecase, it's IMHO good time
>> to explore the it, code-wise and documentation-wise, and fix it or
>> improve.
>>
>> So, what next. I'd like to get rid of the custom chunk allocator, namely
>> because of the known 1MB area misuse and duplication.
>>
>> Implementing the minimalization might need some preparatory work and I
>> don't have a realistic ETA now.
> 
> Well, if using over-reserve-then-shrink method, it could be done, without much hassle.

What about doing it on a file instead of a device ? As sparse file, it would be less expensive to enlarge then shrink. I think that who need to build a filesystem with "shrink", doesn't need to create it on a real block device
> 
> However ETA maybe delayed to middle of Oct, as I'm going to enjoy my holiday during 1st Oct to 7th Oct.
> 
> Thanks,
> Qu
> 
>> Ideally we'd fix both problems in one
>> version, as I'd rather avoid "temporary" solution to drop the
>> minimalization with the promise to put it back later.
>>
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