[Sheepdog] [PATCH v2] sheep: fix get_nr_copies()

[Christoph Hellwig]

On Tue, May 01, 2012 at 12:45:43AM +0800, Liu Yuan wrote:
> From: Liu Yuan <tailai.ly at taobao.com>
> 
> We should never return anything greater than sys->nr_copies.
> 
> - use min() to get the better readability
> - change this function into 'static inline'

does the inlining really buy us that much?  Making the vnode_info
structure private to group.c has the big benefit that we force people
to use accessors and not opencode variants of it.  If we really want
to optimize it a better thing might be to store a precalculated
nr_copies value in addition to nr_zones in it.

> - change sys->nr_copies as 'int' to stay in line with nr_zones

Makes sense.