commit af3a2cd6b8a479345786e7fe5e199ad2f6240e56
author NeilBrown <neilb@suse.de> Sat May 08 08:20:17 2010 +1000
committer NeilBrown <neilb@suse.de> Tue May 18 15:28:00 2010 +1000
tree 10690853d80455e69bcc0d027ad6c8b9c7951332
parent 2dc40f80945ac3e5ec05c3a6c75baf09b13cee51

md: Fix read balancing in RAID1 and RAID10 on drives > 2TB

read_balance uses a "unsigned long" for a sector number which
will get truncated beyond 2TB.
This will cause read-balancing to be non-optimal, and can cause
data to be read from the 'wrong' branch during a resync.  This has a
very small chance of returning wrong data.

Reported-by: Jordan Russell <jr-list-2010@quo.to>
Cc: stable@kernel.org
Signed-off-by: NeilBrown <neilb@suse.de>