[v3 Repost] xfs: Add ratelimited printk for different alert levels

[Ben Myers]

On Wed, Mar 27, 2013 at 09:26:49AM -0500, Rich Johnston wrote:
> Ratelimited printk will be useful in printing xfs messages which are otherwise
> not required to be printed always due to their high rate (to prevent kernel ring
> buffer from overflowing), while at the same time required to be printed.
> 
> Signed-off-by: Raghavendra D Prabhu <rprabhu at wnohang.net>
> Reviewed-by: Rich Johnston <rjohnston at sgi.com>
> Reviewed-by: Dave Chinner <dchinner at redhat.com>

Applied.

Thanks Raghavendra!