[PATCH 1/2] xfs: don't truncate attribute extents if no extents exist

[Christoph Hellwig]

> A '-p 2' fsstress run to ENOSPC on a relatively small fs (1GB)
> reproduces these problems.

Any chance to add this test case to xfstests?

>  	/* invalidate and truncate the attribute fork extents */
> -	if (dp->i_d.di_aformat != XFS_DINODE_FMT_LOCAL) {
> +	if (xfs_inode_hasattr(dp) &&
> +	    dp->i_d.di_aformat != XFS_DINODE_FMT_LOCAL) {

And please add a comment describing the condition here, especially
as xfs_inode_hasattr doesn't have a very descriptive name.