On Sun, Sep 03, 2017 at 08:21:33PM +0200, Christoph Hellwig wrote:
> > So basically there are two bugs here -- the fcollapse/finsert code needs
> > to shift the CoW fork extents down and up;
>
> Or make sure that we don't have any extents in the COW fork?
It's a big hammer approach, but yes that'd work.
We're already forcing all the dirty pages out anyway so I guess it's no
big deal.
> > diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
> > index 9207d61..ae3b18f 100644
> > --- a/fs/xfs/xfs_inode.c
> > +++ b/fs/xfs/xfs_inode.c
> > @@ -1625,7 +1625,7 @@ xfs_itruncate_extents(
> > /*
> > * Clear the reflink flag if we truncated everything.
> > */
> > - if (ip->i_d.di_nblocks == 0 && xfs_is_reflink_inode(ip)) {
> > + if (ip->i_d.di_nblocks == 0 && ip->i_cnextents == 0 && xfs_is_reflink_inode(ip)) {
>
> Btw, it seems like we should generally clear the reflink flag and
> tag if ip->i_cnextents is zero and not even bother looking at di_nblocks.
We can't -- imagine shortening to 8k a reflinked 12k file that hasn't been
written to. It has no cow extents, but we cannot drop the reflink flag.
--D
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