Re: [PATCH -next] ovl: obtain fs magic from superblock

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On Thu, Aug 29, 2024 at 3:25 AM Hongbo Li <lihongbo22@xxxxxxxxxx> wrote:
>
>
>
> On 2024/8/28 23:17, Amir Goldstein wrote:
> > On Wed, Aug 28, 2024 at 1:57 PM Hongbo Li <lihongbo22@xxxxxxxxxx> wrote:
> >>
> >> The sb->s_magic holds the file system magic, we can use
> >> this to avoid use file system magic macro directly.
> >
> > That we can do something, does not mean that we need to do it.
> > I don't see any benefit in this patch.
> > Please explain.
> Just avoid using the macro directly.
>
> This kind of macro definition is like a magic number; once it changes,
> it will affect a large amount of code.
>

As long as sb->s_magic is initialized in exactly the same way,
this argument is moot IMO.

If there comes a time where sb->s_magic would be filled from
persistent storage then this code would make sense.

Thanks,
Amir.





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