[GIT PULL] MD for 4.6

Hi Linus, Could you please pull the MD update for 4.6? This update mainly fixes bugs. - A raid5 discard related fix from Jes - A MD multipath bio clone fix from Ming - raid1 error handling deadlock fix from Nate and corresponding raid10 fix from myself - A raid5 stripe batch fix from Neil - A

[GIT PULL] MD for 4.6

Hi Linus, Could you please pull the MD update for 4.6? This update mainly fixes bugs. - A raid5 discard related fix from Jes - A MD multipath bio clone fix from Ming - raid1 error handling deadlock fix from Nate and corresponding raid10 fix from myself - A raid5 stripe batch fix from Neil - A