tree b2d883aa031c9ed894a0dc797400e312226e8251
parent 57737adc965e45fcb03662fe6f93f6efb19e2c0a
author Lars Ellenberg <lars.ellenberg@linbit.com> 1382518758 +0200
committer Jens Axboe <axboe@kernel.dk> 1383927028 -0700

drbd: fix decoding of bitmap vli rle for device sizes > 64 TB

Symptoms: disconnect after bitmap exchange due to
bitmap overflow (e:49731075554) while decoding bm RLE packet

In the decoding step of the variable length integer run length encoding
there was potentially an uncatched bitshift by wordsize (variable >> 64).

The result of which is "undefined" :(
(only "sometimes" the result is the desired 0)

Fix: don't do any bit shift magic for shift == 64, just assign.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>