xfs: support realtime reflink with an extent size that isn't a power of 2
Add the necessary alignment checking code to the reflink remap code to
ensure that remap requests are aligned to rt extent boundaries if the
realtime extent size isn't a power of two. The VFS helpers assume that
they can use the usual (blocksize - 1) masking to avoid slow 64-bit
division, but since XFS is special we won't make everyone pay that cost
for our weird edge case.
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
4 files changed
