I notice that in old version, if page has no buffer in writepage, then xfs will create a empty buffer and attach to page. This logic there at least untill 2.6.33. But now xfs need this never happens (assert) when coming to writepage. But I guess, when use mmap, there is no buffer attach to page because it operates on page directly on kernel. xfs should create buffer before submit bio. There must be sth I don't know. Maybe sbd can help me out.
Thanks very much,
Mike
On Mon, Aug 30, 2010 at 7:30 PM, Dave Chinner <david@xxxxxxxxxxxxx> wrote:
On Mon, Aug 30, 2010 at 05:56:07PM -0500, Mike Gao wrote:
> Thanks very much for help. The kernel is pretty old, 2.6.19 but the xfs is
> pretty new.
> the block size is 512 and use mmap for test with write and read compare.
> (xfstest 074).
Can you reproduce it on a more recent kernel? The buffer flags are
modified by code outside XFS which could be significantly different in
2.6.19 comapred to 2.6.34/35, so it may not be aproblem with the
XFS code as such....
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
_______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
