[PATCH v3 0/2] btrfs: fix a deadlock between chunk allocation and chunk tree modifications

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.

Filipe Manana (2):
  btrfs: fix deadlock between chunk allocation and chunk btree modifications
  btrfs: update comments for chunk allocation -ENOSPC cases

 fs/btrfs/block-group.c | 166 +++++++++++++++++++++++++++--------------
 fs/btrfs/block-group.h |   2 +
 fs/btrfs/relocation.c  |   4 +
 fs/btrfs/volumes.c     |  15 +++-
 4 files changed, 128 insertions(+), 59 deletions(-)

-- 
2.33.0