[PATCH STABLE 4.19 0/2] btrfs: raid56: backports to reduce corruption

This is the backport for v4.19.x stable branch.

The full explananation can be found here: https://lore.kernel.org/linux-btrfs/cover.1660891713.git.wqu@suse.com/

No code change between v5.4.x and v4.19.x, at least nothing git can not auto-resolve.

Testing wise, there are more test failures, as their coressponding fixes are not backported.

Despite that no new regression so far.

Qu Wenruo (2): btrfs: only write the sectors in the vertical stripe which has data stripes btrfs: raid56: don't trust any cached sector in __raid56_parity_recover()

fs/btrfs/raid56.c | 74 ++++++++++++++++++++++++++++++++++++----------- 1 file changed, 57 insertions(+), 17 deletions(-)