Re: [PATCH 1/8] buffer: make invalidate_bdev() drain all percpuLRU add caches

From: David Miller
Date: Sun May 16 2010 - 03:11:23 EST

From: Tejun Heo <tj@xxxxxxxxxx>
Date: Sat, 15 May 2010 20:09:27 +0200

> invalidate_bdev() should release all page cache pages which are clean
> and not being used; however, if some pages are still in the percpu LRU
> add caches on other cpus, those pages are considered in used and don't
> get released. Fix it by calling lru_add_drain_all() before trying to
> invalidate pages.
> This problem was discovered while testing block automatic native
> capacity unlocking. Null pages which were read before automatic
> unlocking didn't get released by invalidate_bdev() and ended up
> interfering with partition scan after unlocking.
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>

Acked-by: David S. Miller <davem@xxxxxxxxxxxxx>
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