fix swapon for recently unshared blocks

[Christoph Hellwig <hch@xxxxxx>]

Hi all,

the first patch fixes the recently added generic/370, and the
second one does a bit of naming cleanup in the area.

Diffstat:
 xfs_aops.c |   24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)