Re: [PATCH v2] xfs: publish UUID in struct super_block

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On Fri, Apr 28, 2017 at 05:00:01PM +0300, Amir Goldstein wrote:
> Copy the uuid of the filesystem to struct super_block s_uuid field,
> as several other filesystems already do.  Copy regardless of the nouuid
> mount option, because other filesystems also do not guaranty uniqueness
> of the s_uuid field in super_block struct.

No guaranteeing uniqueness will create problems, don't do that.

Other file system didn't use to do the uuid table check that XFS did
either, and that's a fatal bug.  In the long run we'll need to move
this check to the VFS now that we have s_uuid.

Also while checking for a nul uuid is probably ok we need to formalize
that at least that the check is needed.  Preferably by adding a little
inline helper for it, and documenting it.
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