[btrfs-devel][patch]fix for btrfs_truncate_in_trans

[Christoph Hellwig]

On Tue, Sep 18, 2007 at 10:24:56AM -0400, Chris Mason wrote:
> On Tue, 18 Sep 2007 16:22:33 +0200
> Christoph Hellwig <hch at lst.de> wrote:
> 
> > On Tue, Sep 18, 2007 at 10:13:13AM -0400, Chris Mason wrote:
> > > try_release_extent_mapping should also be changed not to drop things
> > > from the extent mapping tree if they are EXTENT_MAP_DELALLOC.
> > 
> > What XFS does here and what I plan to port over to the extent_map
> > code is that ->releasepage will start the delalloc conversion so that
> > the page is a simple dirty page and we can drop it, but not actually
> > start I/O.
> > 
> 
> Shouldn't this have already been kicked off by writepage?

delalloc conversion is also kicked of by writepage, but we can get into
->releasepage without having called writepage before.