[PATCH 1/4] xfs: Don't allocate new buffers on every call to _xfs_buf_find

[Alex Elder]

On Fri, 2011-08-26 at 04:11 -0400, Christoph Hellwig wrote:
. . .
> >  
> > +found:
> > +	ASSERT(bp->b_flags & XBF_MAPPED);
> 
> This doesn't look right to me.  Various buffers like inode or remoate attrs
> are unmapped, and I can't see any reason why we would assert not beeing
> allowed to find them here.
> 
> Thinking about it more I'm also not sure skipping the code to map
> buffers on a straight cache hit is a good idea - there's nothing
> inherent to requiring a given buffer to be mapped for all callers.

I actually tripped this assert last night the first time I
tried running it.

					-Alex