On Wed, Oct 13, 2021 at 10:12:48AM +0100, fdmanana@kernel.org wrote:

From: Filipe Manana <redacted>

This fixes a deadlock between a task allocating a metadata or data chunk
and a task that is modifying the chunk btree and it's not in a chunk
allocation or removal context. The first patch is the fix, the second one
just updates a couple comments and it's independent of the fix.

v2: Updated stale comment after the fix (patch 1/2).

v3: Moved the logic to reserve chunk space out of btrfs_search_slot() into
    every path that modifies the chunk btree (which are the cases listed in
    the change log of patch 1/2) and updated two more comments in patch 1/2.

Added to misc-next, thanks.