Set gendisk fops. (IBM logical volume manager, for one, needs this.)
diff -urN linux-2.5.41-o/drivers/block/cciss.c linux-2.5.41-p/drivers/block/cciss.c
--- linux-2.5.41-o/drivers/block/cciss.c Wed Oct 9 15:08:22 2002
+++ linux-2.5.41-p/drivers/block/cciss.c Wed Oct 9 15:22:14 2002
@@ -2501,6 +2501,7 @@
disk->major = MAJOR_NR + i;
disk->first_minor = j << NWD_SHIFT;
disk->minor_shift = NWD_SHIFT;
+ disk->fops = &cciss_fops;
if( !(drv->nr_blocks))
continue;
(BLK_DEFAULT_QUEUE(MAJOR_NR + i))->hardsect_size = drv->block_size;