jfs: Add splice support

This allows the splice() and tee() syscalls to be used with JFS.

Signed-off-by: Daniel Drake <ddrake@brontes3d.com>
Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
---

--- a/fs/jfs/file.c
+++ b/fs/jfs/file.c
@@ -109,6 +109,8 @@ const struct file_operations jfs_file_op
 	.aio_write	= generic_file_aio_write,
 	.mmap		= generic_file_mmap,
 	.sendfile	= generic_file_sendfile,
+	.splice_read	= generic_file_splice_read,
+	.splice_write	= generic_file_splice_write,
 	.fsync		= jfs_fsync,
 	.release	= jfs_release,
 	.ioctl		= jfs_ioctl,