On Tue, Nov 22, 2016 at 12:08:47PM -0800, Liu Bo wrote:
> On Tue, Nov 22, 2016 at 02:13:21PM -0500, Chris Mason wrote:
> > On 11/11/2016 05:27 PM, Liu Bo wrote:
> > > For such a file mapping,
> > >
> > > [0-4k][hole][8k-12k]
> > >
> > > In NO_HOLES mode, we don't have the [hole] extent any more.
> > > Commit c1aa45759e90 ("Btrfs: fix shrinking truncate when the no_holes feature is enabled")
> > > fixed disk isize not being updated in NO_HOLES mode when data is not flushed.
> > >
> > > However, even if data has been flushed, we can still have trouble
> > > in updating disk isize since we updated disk isize to 'start' of
> > > the last evicted extent.
> > >
> > > Also add a ASSERT for better catching (for developers only).
> > >
> > > Signed-off-by: Liu Bo <bo.li.liu@xxxxxxxxxx>
> >
> > Thanks Liu!
> >
> > Reviewed-by: Chris Mason <clm@xxxxxx>
>
> The added ASSERT() can cause generic/068 to crash because I didn't
> filter out the 'log tree' case, I'm testing a V2 patch.
I've hit the assert with btrfs/003, once and not deterministically in a VM.
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