linux-kernel - Re: forced umount?

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Message-ID: <Pine.LNX.4.64.0703270929030.31885@sbz-30.cs.Helsinki.FI>
Date:	Tue, 27 Mar 2007 09:32:05 +0300 (EEST)
From:	Pekka J Enberg <penberg@...helsinki.fi>
To:	Phillip Susi <psusi@....rr.com>
cc:	Mike Snitzer <snitzer@...il.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: forced umount?

On Mon, 26 Mar 2007, Phillip Susi wrote:
> Is this revoke system supported for the filesystem as a whole?  I thought it
> was just to force specific files closed, not the whole filesystem.  What if
> the filesystem itself has pending IO to say, update inodes or block bitmaps?
> Can these be aborted?

We never want to _abort_ pending updates only pending reads. So, even with 
revoke(), we need to be careful which is why we do do_fsync() in 
generic_revoke_file() to make sure pending updates are flushed before we 
declare the inode revoked.

But, I haven't looked at forced unmount that much so there may be other 
issues I am not aware of.

			Pekka
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