linux-kernel - Re: [PATCH 01/22] Revert "afs: Move UUID struct to linux/uuid.h"

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Date:   Tue, 30 May 2017 11:00:04 +0100
From:   David Howells <dhowells@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     dhowells@...hat.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Amir Goldstein <amir73il@...il.com>,
        linux-fsdevel@...r.kernel.org, Shaohua Li <shli@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Steven Whitehouse <swhiteho@...hat.com>,
        Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        linux-xfs@...r.kernel.org, linux-raid@...r.kernel.org,
        linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org
Subject: Re: [PATCH 01/22] Revert "afs: Move UUID struct to linux/uuid.h"

Christoph Hellwig <hch@....de> wrote:

> This reverts commit ff548773106ec7f8031bc6172e0234bd2a02c19c.
> 
> The V1 uuid intrepreatation in struct form isn't really useful to the
> rest of the kernel, and not really compatible to it either, so move it
> back to AFS instead of polluting the global uuid.h.

This isn't going to work.  You've effectively changed the types of the fields
in the UUID struct from BE to CPU-endian, but you're still calling
generate_random_uuid(), which produces a BE UUID.  You need to leave the
struct members as __beXX or stop using the core UUID routines.

Just move the struct uuid_v1 as-is to the afs headers and rename it to struct
afs_uuid.  You can then leave the (un)marshalling code alone.

David