tree df1002e5eccbf4b241dc9e948bb894de2106d6e2
parent cbea21703b2484f83faef040ed1de30114794392
author NeilBrown <neilb@suse.de> 1311728436 +1000
committer NeilBrown <neilb@suse.de> 1311728436 +1000

md/raid5: Avoid BUG caused by multiple failures.

While preparing to write a stripe we keep the parity block or blocks
locked (R5_LOCKED) - towards the end of schedule_reconstruction.

If the array is discovered to have failed before this write completes
we can leave those blocks LOCKED, and init_stripe will notice that a
free stripe still has a locked block and will complain.

So clear the R5_LOCKED flag in handle_failed_stripe, and demote the
'BUG' to a 'WARN_ON'.

Signed-off-by: NeilBrown <neilb@suse.de>