Re: [PATCH v2 3/3] fs: ubifs: set s_uuid in super block

[Amir Goldstein]

On Tue, May 9, 2017 at 10:35 AM, Richard Weinberger <richard@xxxxxx> wrote:
> Amir,
>
> Am 09.05.2017 um 09:08 schrieb Amir Goldstein:
>>> Then we can queue this patch for 4.13.
>>> Please resend and make sure it addresses everything what was also
>>> suggested for the xfs s_uuid patch.
>>>
>>
>> Just to be clear, the xfs s_uuid patch is just a memcpy,
>> no different from Oleksij's patch.

See upstream commit
8f720d9 xfs: publish UUID in struct super_block


>
> Wasn't there a huge discussion about LE/BE/uniqueness and more details
> on UUID that hurt my brain.
>

LE/BE discussions are more about which variants of uuid helpers should be
created, among other things, for consumers of s_uuid to check that s_uuid
was filled by fs.
Converting s_uuid type to uuid_t or whatever is for the far future.

uniqueness of s_uuid does not exist with current filesystems,
so no reason whatsoever to act differently with ubifs.
Fixing uniqueness of s_uuid (if at all is needed) is a future VFS task.

Bottom line, for Oleksij's original patch:

Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>

If it's not too late for 4.12 that could be nice, because then
ubifs+overlayfs would gain a new feature (constant inode numbers)