linux-kernel - Re: [PATCH] fsstack: fsstack_copy_inode

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Message-ID: <20080630214901.GA8900@halcrowt61p.austin.ibm.com>
Date:	Mon, 30 Jun 2008 16:49:01 -0500
From:	Michael Halcrow <mhalcrow@...ibm.com>
To:	Erez Zadok <ezk@...sunysb.edu>
Cc:	Hugh Dickins <hugh@...itas.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	hooanon05@...oo.co.jp, viro@...iv.linux.org.uk,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fsstack: fsstack_copy_inode_size locking

On Mon, Jun 30, 2008 at 02:19:27PM -0400, Erez Zadok wrote:
> BTW, ecryptfs may have a problem with this, b/c it uses
> i_size_read/write b/t the lower and upper inodes.  If some
> filesystems have a different interpretation for i_size, then
> stacking ecryptfs on top of them could be an issue.  Mike?

eCryptfs depends on the results of i_size_read() on the lower inode
when it needs to interpolate the filesize when the metadata is stored
in the lower file's xattr region.
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