linux-ext4 - Re: [PATCH 1/8] far: remove i_alloc

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Date:	Tue, 21 Jun 2011 12:09:42 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Christoph Hellwig <hch@...radead.org>, viro@...iv.linux.org.uk,
	tglx@...utronix.de, linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org, linux-btrfs@...r.kernel.org,
	mfasheh@...e.com, jlbec@...lplan.org
Subject: Re: [PATCH 1/8] far: remove i_alloc_sem abuse

On Wed, Jun 22, 2011 at 12:57:43AM +0900, OGAWA Hirofumi wrote:
> Christoph Hellwig <hch@...radead.org> writes:
> 
> > Add a new rw_semaphore to protect bmap against truncate.  Previous
> > i_alloc_sem was abused for this, but it's going away in this series.
> 
> In FAT case, ->i_mutex was better. But, last time I saw, shmfs was using
> ->i_mutex to call ->bmap. So, this was chosen instead.
> 
> I'm not checking current version yet though, if shmfs had change, we can
> use ->i_mutex.

I tried that first, but it gives an instant deadlock when using a
swapfile on fat.

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