About QUOTA support in stock kernel (resent)

[Konstantin Belousov]

On Tue, Dec 25, 2012 at 09:34:30PM +0800, Patrick Dung wrote:
> Hi,
> 
> I would like to know why quota is not enabled in the stock kernel..
> 
> I remembered that it is not enabled since freebsd 3.5 or freebsd 4 generation.
> Now in freebsd 9.0, it still neeed a kernel rebuild.
> 
> I have heard it has performance issue (GIANT lock) about quota.

Enabling quota by default would cause small overhead, like one mutex acquire,
for each inode and block alloc/dealloc, even for mount without quotas enabled.

Might be, it is reasonable to just enable it now. Unless somebody provide
valid objections and I do not forget, I will do it in a week for HEAD.
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