Re: [RFC][PATCH] fstests: regression test for xfs leftover CoW extent error

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> 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?

> 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.
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