[PATCH 047/119] xfs: disable XFS_IOC_SWAPEXT when rmap btree is enabled

[Brian Foster]

On Thu, Jun 16, 2016 at 06:22:53PM -0700, Darrick J. Wong wrote:
> Swapping extents between two inodes requires the owner to be updated
> in the rmap tree for all the extents that are swapped. This code
> does not yet exist, so switch off the XFS_IOC_SWAPEXT ioctl until
> support has been implemented. This will need to be done before the
> rmap btree code can have the experimental tag removed.
> 
> Signed-off-by: Dave Chinner <dchinner at redhat.com>
> [darrick.wong at oracle.com: fix extent swapping when rmap enabled]
> Signed-off-by: Darrick J. Wong <darrick.wong at oracle.com>
> ---

Reviewed-by: Brian Foster <bfoster at redhat.com>

>  fs/xfs/xfs_bmap_util.c |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> 
> diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
> index 450fd49..8666873 100644
> --- a/fs/xfs/xfs_bmap_util.c
> +++ b/fs/xfs/xfs_bmap_util.c
> @@ -1618,6 +1618,10 @@ xfs_swap_extents(
>  	__uint64_t	tmp;
>  	int		lock_flags;
>  
> +	/* XXX: we can't do this with rmap, will fix later */
> +	if (xfs_sb_version_hasrmapbt(&mp->m_sb))
> +		return -EOPNOTSUPP;
> +
>  	tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
>  	if (!tempifp) {
>  		error = -ENOMEM;
> 
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