linux-kernel - Re: [PATCH 08/12] superblock: introduce per-sb cache shrinker infrastructure

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Message-ID: <20110604140848.GA20404@infradead.org>
Date:	Sat, 4 Jun 2011 10:08:48 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, xfs@....sgi.com
Subject: Re: [PATCH 08/12] superblock: introduce per-sb cache shrinker
 infrastructure

On Sat, Jun 04, 2011 at 11:52:12AM +1000, Dave Chinner wrote:
> I wanted to put it early on in the unmount path so that the shrinker
> was guaranteed to be gone before evict_inodes() was called. That
> would mean that it is obviously safe to remove the iprune_sem
> serialisation in that function.

The iprune_sem removal is fine as soon as you have a per-sb shrinker
for the inodes which keeps an active reference on the superblock until
all the inodes are evicted.

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