[Ocfs2-devel] [PATCH] ocfs2: Fix possible deadlock when extending quota file

[Joel Becker]

On Thu, Aug 06, 2009 at 11:29:34PM +0200, Jan Kara wrote:
> In OCFS2, allocator locks rank above transaction start. Thus we
> cannot extend quota file from inside a transaction less we could
> deadlock.
> 
> We solve the problem by starting transaction not already in
> ocfs2_acquire_dquot() but only in ocfs2_local_read_dquot() and
> ocfs2_global_read_dquot() and we allocate blocks to quota files before starting
> the transaction.  In case we crash, quota files will just have a few blocks
> more but that's no problem since we just use them next time we extend the
> quota file.
> 
> Signed-off-by: Jan Kara <jack at suse.cz>

	This patch is now in the fixes branch of ocfs2.git.

Joel

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Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker at oracle.com
Phone: (650) 506-8127