[PATCH 05/11] xfs: reinstate the ilock in xfs_readdir

[Dave Chinner]

On Fri, Dec 06, 2013 at 12:30:11PM -0800, Christoph Hellwig wrote:
> From: Ben Myers <bpm at sgi.com>
> 
> Although it was removed in commit 051e7cd44ab8, ilock needs to be taken in
> xfs_readdir because we might have to read the extent list in from disk.  This
> keeps other threads from reading from or writing to the extent list while it is
> being read in and is still in a transitional state.
> 
> This has been associated with "Access to block zero" messages on directories
> with large numbers of extents resulting from excessive filesytem fragmentation,
> as well as extent list corruption.  Unfortunately no test case at this point.
> 
> Signed-off-by: Ben Myers <bpm at sgi.com>

Looks good.

Reviewed-by: Dave Chinner <dchinner at redhat.com>
-- 
Dave Chinner
david at fromorbit.com