Re: [PATCH 01/34] xfs: provide a inode iolock lockdep class

Christoph Hellwig
2010-12-21T15:13:55Z

On Tue, Dec 21, 2010 at 06:28:57PM +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner@redhat.com>
>
> The XFS iolock needs to be re-initialised to a new lock class before
> it enters reclaim to prevent lockdep false positives. Unfortunately,
> this is not sufficient protection as inodes in the XFS_IRECLAIMABLE
> state can be recycled and not re-initialised before being reused.
>
> We need to re-initialise the lock state when transfering out of
> XFS_IRECLAIMABLE state to XFS_INEW, but we need to keep the same
> class as if the inode was just allocated. Hence we need a specific
> lockdep class variable for the iolock so that both initialisations
> use the same class.
>
> While there, add a specific class for inodes in the reclaim state so
> that it is easy to tell from lockdep reports what state the inode
> was in that generated the report.
>
> Signed-off-by: Dave Chinner <dchinner@redhat.com>

I think I already reviewed this one, but in case it got lost: