msdosfs not MPSAFE

[Kostik Belousov]

On Fri, Aug 10, 2007 at 01:54:48PM +1000, Bruce Evans wrote:
> I wrote yet another patch, with allocation on the stack so that no locking
> is required.  This is simpler and doesn't require any new functions.
> Unfortunately, it is larger because it changes the interfaces for most
> functions.  The interface changes are routine, so this is probably better.
> Note that 'struct dirent's are already allocated on the stack.  This
> patch adds allocation of 'struct mbnambuf's which are slightly smaller
> (~256 bytes).  I think this is just small enough for stack allocation.

I agree that this is the best approach. The size of the on-stack
structure still make me worry, although ~270 bytes seems to be not too
large for 3-pages stack.
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