On Thu, May 01, 2014 at 10:00:53PM -0700, Christoph Hellwig wrote:
> On Thu, May 01, 2014 at 09:54:43PM -0700, Christoph Hellwig wrote:
> > On Fri, May 02, 2014 at 08:39:39AM +1000, Dave Chinner wrote:
> > > This issue with xfs_setattr_size() was introduced back in 2010 by
> > > commit fa9b227 ("xfs: new truncate sequence") which moved the page
> > > cache truncate from outside the transaction context (what was
> > > xfs_itruncate_data()) to inside the transaction context as a call to
> > > truncate_setsize().
> > And it was moved because we should only call truncate_setsize once
> > the truncate can't fail any more. So to move it out of transaction
> > context it needs to move after the commit of the transaction(s).
> Actually that's only true for the i_size update. So I guess
> we need to call truncate_pagecache were you put the truncate_setsize
> now, and then update i_size later, together with the updates of the
> XFS di_size.
OK, that seems reasonable. I'll add a comment to ensure that we
don't break it in future ;)