[PATCH v2 00/13] btrfs: some fixes and updates around handling errors for tree mod log operations

[fdmanana@kernel.org]

From: Filipe Manana <fdmanana@suse.com>

This mostly helps avoid some unnecessary enomem failures when logging
tree mod log operations and replace some BUG_ON()'s when dealing with
such failures. There's also 2 bug fixes (the first two patches) and
some cleanups. More details on the changelogs.

V2: Add explicit error messages in patches 8/13 and 9/13.
    Add missing unlock and ref count drop of 'right' extent buffer to patch 12/13.
    Add missing extent buffer ref count drops for right and mid extent buffers in
    error paths of balance_level() to patch 13/13.
    Fix subject of patch 2/13 (removed duplicated word).
    Added Reviewed-by tags where appropriate.

Filipe Manana (13):
  btrfs: add missing error handling when logging operation while COWing extent buffer
  btrfs: fix extent buffer leak after tree mod log failure at split_node()
  btrfs: avoid tree mod log ENOMEM failures when we don't need to log
  btrfs: do not BUG_ON() on tree mod log failure at __btrfs_cow_block()
  btrfs: do not BUG_ON() on tree mod log failure at balance_level()
  btrfs: rename enospc label to out at balance_level()
  btrfs: avoid unnecessarily setting the fs to RO and error state at balance_level()
  btrfs: abort transaction at balance_level() when left child is missing
  btrfs: abort transaction at update_ref_for_cow() when ref count is zero
  btrfs: do not BUG_ON() on tree mod log failures at push_nodes_for_insert()
  btrfs: do not BUG_ON() on tree mod log failure at insert_new_root()
  btrfs: do not BUG_ON() on tree mod log failures at insert_ptr()
  btrfs: do not BUG_ON() on tree mod log failures at btrfs_del_ptr()

 fs/btrfs/ctree.c        | 221 +++++++++++++++++++++++++++++-----------
 fs/btrfs/ctree.h        |   4 +-
 fs/btrfs/tree-mod-log.c | 148 ++++++++++++++++++++-------
 3 files changed, 279 insertions(+), 94 deletions(-)

-- 
2.34.1