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>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index a81eca6434dd..b874f42694e2 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -340,7 +340,7 @@ static void init_stripe(struct stripe_head *sh, sector_t sector, int previous)
                                (unsigned long long)sh->sector, i, dev->toread,
                                dev->read, dev->towrite, dev->written,
                                test_bit(R5_LOCKED, &dev->flags));
-                        BUG();
+                        WARN_ON(1);
                 }
                 dev->flags = 0;
                 raid5_build_block(sh, i, previous);
@@ -2301,6 +2301,10 @@ handle_failed_stripe(raid5_conf_t *conf, struct stripe_head *sh,
                 if (bitmap_end)
                         bitmap_endwrite(conf->mddev->bitmap, sh->sector,
                                         STRIPE_SECTORS, 0, 0);
+                /* If we were in the middle of a write the parity block might
+                 * still be locked - so just clear all R5_LOCKED flags
+                 */
+                clear_bit(R5_LOCKED, &sh->dev[i].flags);
         }
 
         if (test_and_clear_bit(STRIPE_FULL_WRITE, &sh->state))