[XFS] split xfs_ioc_xattr

The three subcases of xfs_ioc_xattr don't share any semantics and almost
no code, so split it into three separate helpers.

SGI-PV: 976035
SGI-Modid: xfs-linux-melb:xfs-kern:30709a

Signed-off-by: Christoph Hellwig <[email protected]>
Signed-off-by: Lachlan McIlroy <[email protected]>
1 file changed