On Fri, 2010-07-23 at 20:41 +1000, Dave Chinner wrote: > From: Dave Chinner <dchinner@xxxxxxxxxx> > > If we do unaligned direct IO to a unwritten extent, the direct Io > code does sub-block zeroing for us. However, we need to serialise > the sub-block zeroing as we canot have another outstanding IO to the > same block that is being zeroed at the same time. Ifw e do so, then > we'll have two direct IOs to the same block that zero different > portions of the block and we'll end up with zeros where we should > have data. > > Serialise such IOs in the get_blocks callback when we know that we > are mapping an unaligned direct IO. This initial implementation is > the sledge-hammer approach - we can probably be finer grained than > this to avoid excessive serialisation when all IO is unaligned to a > file. > > Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx> Looks good. Reviewed-by: Alex Elder <aelder@xxxxxxx> _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
