linux-ext4 - Re: [PATCH 4/8] fs: kill i_alloc

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Date:	Mon, 20 Jun 2011 18:18:57 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	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,
	hirofumi@...l.parknet.co.jp, mfasheh@...e.com
Subject: Re: [PATCH 4/8] fs: kill i_alloc_sem

On Mon, Jun 20, 2011 at 02:32:03PM -0700, Joel Becker wrote:
> 	Are we guaranteed that all allocation changes are locked out by
> i_dio_count>0?  I don't think we are.  The ocfs2 code very strongly
> assumes the state of a file's allocation when it holds i_alloc_sem.  I
> feel like we lose that here. 

You aren't, neither with the old i_alloc_sem code, nor with the 1:1
replacement using i_dio_count.

Do a quick grep who gets i_alloc_sem exclusively (down_write): it's
really just the truncate code, and it's cut & paste duplicates in ntfs
and reiserfs.

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