jfs: Add splice support

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

Signed-off-by: Daniel Drake <[e-mail]>
Signed-off-by: Dave Kleikamp <[e-mail]>

fs/jfs/file.c

···
 	.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,