[PATCH 00/18] btrfs: convert delayed head refs to xarray and cleanups

[fdmanana@kernel.org]

From: Filipe Manana <fdmanana@suse.com>

This converts the rb-tree that tracks delayed ref heads into an xarray,
reducing memory used by delayed ref heads and making it more efficient
to add/remove/find delayed ref heads. The rest are mostly cleanups and
refactorings, removing some dead code, deduplicating code, move code
around, etc. More details in the changelogs.

Filipe Manana (18):
  btrfs: remove BUG_ON() at btrfs_destroy_delayed_refs()
  btrfs: move btrfs_destroy_delayed_refs() to delayed-ref.c
  btrfs: remove fs_info parameter from btrfs_destroy_delayed_refs()
  btrfs: remove fs_info parameter from btrfs_cleanup_one_transaction()
  btrfs: remove duplicated code to drop delayed ref during transaction abort
  btrfs: use helper to find first ref head at btrfs_destroy_delayed_refs()
  btrfs: remove num_entries atomic counter from delayed ref root
  btrfs: change return type of btrfs_delayed_ref_lock() to boolean
  btrfs: simplify obtaining a delayed ref head
  btrfs: move delayed ref head unselection to delayed-ref.c
  btrfs: pass fs_info to functions that search for delayed ref heads
  btrfs: pass fs_info to btrfs_cleanup_ref_head_accounting
  btrfs: assert delayed refs lock is held at find_ref_head()
  btrfs: assert delayed refs lock is held at find_first_ref_head()
  btrfs: assert delayed refs lock is held at add_delayed_ref_head()
  btrfs: add comments regarding locking to struct btrfs_delayed_ref_root
  btrfs: track delayed ref heads in an xarray
  btrfs: remove no longer used delayed ref head search functionality

 fs/btrfs/backref.c     |   3 +-
 fs/btrfs/delayed-ref.c | 319 +++++++++++++++++++++++++----------------
 fs/btrfs/delayed-ref.h |  61 +++++---
 fs/btrfs/disk-io.c     |  79 +---------
 fs/btrfs/disk-io.h     |   3 +-
 fs/btrfs/extent-tree.c |  69 ++-------
 fs/btrfs/transaction.c |   8 +-
 7 files changed, 256 insertions(+), 286 deletions(-)

-- 
2.43.0