linux-kernel - Re: [PATCH 1/8] buffer: make invalidate_bdev() drain all percpu LRU add caches

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Message-Id: <20100516.001116.216765419.davem@davemloft.net>
Date:	Sun, 16 May 2010 00:11:16 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	tj@...nel.org
Cc:	jeff@...zik.org, linux-ide@...r.kernel.org, jens.axboe@...cle.com,
	linux-scsi@...r.kernel.org, James.Bottomley@...e.de,
	linux-kernel@...r.kernel.org, ben@...adent.org.uk,
	bzolnier@...il.com
Subject: Re: [PATCH 1/8] buffer: make invalidate_bdev() drain all percpu
 LRU add caches

From: Tejun Heo <tj@...nel.org>
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@...nel.org>

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