[PATCH 0/7] Reduce filesystem writeback from page reclaim v3

[Christoph Hellwig]

On Wed, Aug 10, 2011 at 11:47:13AM +0100, Mel Gorman wrote:
>   o Dropped btrfs warning when filesystems are called from direct
>     reclaim. The fallback method for migration looks indistinguishable
>     from direct reclaim.

The right fix is to simply remove that fallback, possibly in combination
with implementating real migration support for btrfs.