[PATCH 0/2] btrfs: raid56: minor fixes to rmw_rbio()

[Qu Wenruo <wqu@suse.com>]

I was checking the bio_list_lock usage as some call sites doesn't look
sane, e.g. spin_lock(); set_bit(); spin_unlock();.

But during the cleanup and reviewing, LLM exposed two new bugs:

- rbio_orig_end_io() can race with lock_stripe_add()
  And rbio_orig_end_io() didn't hold the bio_list_lock, under certain
  race condition, a bio can even be missing.

  Fixed by the first patch.

- Failed rbio can still be cached
  Fixed by the second patch.

Qu Wenruo (2):
  btrfs: fix racy bio_list changes for failed RMW rbio
  btrfs: don't cache rbio if an error is hit

 fs/btrfs/raid56.c | 35 +++++++++++++++++++++++------------
 1 file changed, 23 insertions(+), 12 deletions(-)

-- 
2.56.0