linux-kernel - Re: [PATCH 2/3] eCryptfs: Generalize metadata read/write

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Date:	Tue, 9 Jan 2007 14:31:15 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Michael Halcrow <mhalcrow@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, tshighla@...ibm.com,
	theotso@...ibm.com
Subject: Re: [PATCH 2/3] eCryptfs: Generalize metadata read/write

On Tue, 9 Jan 2007 16:22:55 -0600
Michael Halcrow <mhalcrow@...ibm.com> wrote:

> +		lower_file->f_op->write(lower_file, (char __user *)page_virt,
> +					PAGE_CACHE_SIZE, &lower_file->f_pos);

hm.  sys_write() takes a local copy of f_pos and writes that back into the
struct file.  It does this so that two concurrent write() callers don't
make a mess of f_pos, and of the file contents.

Perhaps ecryptfs should be calling vfs_write()?

That way we'd also get the fsnotify notifications, which ecryptfs presently
appears to have subverted.

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