Re: [PATCH 8/9] overlay: overlay filesystem documentation

[Miklos Szeredi]

On Thu, Mar 14, 2013 at 12:06 AM, Andrew Morton
<akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> On Wed, 13 Mar 2013 15:16:32 +0100 Miklos Szeredi <miklos@xxxxxxxxxx> wrote:
>
>> From: Neil Brown <neilb@xxxxxxx>
>>
>> Document the overlay filesystem.
>>
>
> Damn, I did it again.  This is good, thanks.
>
>> +Changes to the underlying filesystems while part of a mounted overlay
>> +filesystem are not allowed.  If the underlying filesystem is changed,
>> +the behavior of the overlay is undefined, though it will not result in
>> +a crash or deadlock.
>
> ah-hah, there it is.  I was wondering how this can-o-worms would be
> handled ;)
>
> Is there anything in place to enforce this at runtime?  Checks for
> read-onlyness, code to prevent rw remounts, etc?

No, currently it is not enforced.  I didn't think this was important
enough, and there was no complaint about this from users.  I think
most people are going to be careful, especially if lots of warnings
are given in the documentation.

Thanks,
Miklos
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